# Number 19

## Properties#

- 19 is 1st centered triangular prime for n = 3
- 19 is 8th chen prime
- 19 is part of 4th cousin prime {
**19**, 23} - 19 is 2nd cuban prime 1
- 19 is 3rd happy prime
- 19 is 3rd long prime
- 19 is 7th pierpont prime
- 19 is 8th prime
- 19 is part of 2nd prime quadruplet {11, 13, 17,
**19**} - 19 is part of 1st prime quintuplet 1 {7, 11, 13, 17,
**19**} - 19 is part of 2nd prime quintuplet 2 {11, 13, 17,
**19**, 23} - 19 is part of 1st prime sextuplet {7, 11, 13, 17,
**19**, 23} - 19 is part of 5th prime triplet {17,
**19**, 23} - 19 is part of 4th prime triplet {13, 17,
**19**} - 19 is part of 4th sexy prime {13,
**19**} - 19 is part of 2nd sexy prime triplet {7, 13,
**19**} - 19 is 7th solinas prime
- 19 is part of 4th twin prime {17,
**19**}

## External#

## Neighbours#

7_{37} | 8 | 9_{1} | 10_{1} | 11_{36} |

12 | 13_{32} | 14_{1} | 15_{1} | 16 |

17_{36} | 18 | 19_{18} | 20 | 21_{1} |

22_{1} | 23_{30} | 24 | 25_{1} | 26_{1} |

27 | 28 | 29_{14} | 30 | 31_{18} |

## Compare with#

7_{37} | 8 | 9_{1} | 10_{1} | 11_{36} |

12 | 13_{32} | 14_{1} | 15_{1} | 16 |

17_{36} | 18 | 19_{18} | 20 | 21_{1} |

22_{1} | 23_{30} | 24 | 25_{1} | 26_{1} |

27 | 28 | 29_{14} | 30 | 31_{18} |

## Different Representations#

- 19 in roman numerals is XIX
- 19 in base 2 is 10011
_{2} - 19 in base 3 is 201
_{3} - 19 in base 4 is 103
_{4} - 19 in base 5 is 34
_{5} - 19 in base 6 is 31
_{6} - 19 in base 7 is 25
_{7} - 19 in base 8 is 23
_{8} - 19 in base 9 is 21
_{9} - 19 in base 10 is 19
_{10} - 19 in base 11 is 18
_{11} - 19 in base 12 is 17
_{12} - 19 in base 13 is 16
_{13} - 19 in base 14 is 15
_{14} - 19 in base 15 is 14
_{15} - 19 in base 16 is 13
_{16}

## Belongs Into#

- 19 belongs into first 10 centered triangular primes.
- 19 belongs into first 10 chen primes.
- 19 belongs into first 10 cousin primes.
- 19 belongs into first 10 cuban prime 1s.
- 19 belongs into first 10 happy primes.
- 19 belongs into first 10 long primes.
- 19 belongs into first 10 pierpont primes.
- 19 belongs into first 10 primes.
- 19 belongs into first 10 prime quadruplets.
- 19 belongs into first 10 prime quintuplet 1s.
- 19 belongs into first 10 prime quintuplet 2s.
- 19 belongs into first 10 prime sextuplets.
- 19 belongs into first 10 prime triplets.
- 19 belongs into first 10 prime triplets.
- 19 belongs into first 10 sexy primes.
- 19 belongs into first 10 sexy prime triplets.
- 19 belongs into first 10 solinas primes.
- 19 belongs into first 10 twin primes.

## You May Also Ask#

- Is 19 additive prime?
- Is 19 bell prime?
- Is 19 carol prime?
- Is 19 centered decagonal prime?
- Is 19 centered heptagonal prime?
- Is 19 centered square prime?
- Is 19 centered triangular prime?
- Is 19 chen prime?
- Is 19 class 1+ prime?
- Is 19 part of cousin prime?
- Is 19 cuban prime 1?
- Is 19 cuban prime 2?
- Is 19 cullen prime?
- Is 19 dihedral prime?
- Is 19 double mersenne prime?
- Is 19 emirps?
- Is 19 euclid prime?
- Is 19 factorial prime?
- Is 19 fermat prime?
- Is 19 fibonacci prime?
- Is 19 genocchi prime?
- Is 19 good prime?
- Is 19 happy prime?
- Is 19 harmonic prime?
- Is 19 isolated prime?
- Is 19 kynea prime?
- Is 19 left-truncatable prime?
- Is 19 leyland prime?
- Is 19 long prime?
- Is 19 lucas prime?
- Is 19 lucky prime?
- Is 19 mersenne prime?
- Is 19 mills prime?
- Is 19 multiplicative prime?
- Is 19 palindromic prime?
- Is 19 pierpont prime?
- Is 19 pierpont prime of the 2nd kind?
- Is 19 prime?
- Is 19 part of prime quadruplet?
- Is 19 part of prime quintuplet 1?
- Is 19 part of prime quintuplet 2?
- Is 19 part of prime sextuplet?
- Is 19 part of prime triplet?
- Is 19 proth prime?
- Is 19 pythagorean prime?
- Is 19 quartan prime?
- Is 19 restricted left-truncatable prime?
- Is 19 restricted right-truncatable prime?
- Is 19 right-truncatable prime?
- Is 19 safe prime?
- Is 19 semiprime?
- Is 19 part of sexy prime?
- Is 19 part of sexy prime quadruplets?
- Is 19 part of sexy prime triplet?
- Is 19 solinas prime?
- Is 19 sophie germain prime?
- Is 19 super prime?
- Is 19 thabit prime?
- Is 19 thabit prime of the 2nd kind?
- Is 19 part of twin prime?
- Is 19 two-sided prime?
- Is 19 ulam prime?
- Is 19 wagstaff prime?
- Is 19 weakly prime?
- Is 19 wedderburn-etherington prime?
- Is 19 wilson prime?
- Is 19 woodall prime?

## Smaller than 19#

- Additive primes up to 19
- Bell primes up to 19
- Carol primes up to 19
- Centered decagonal primes up to 19
- Centered heptagonal primes up to 19
- Centered square primes up to 19
- Centered triangular primes up to 19
- Chen primes up to 19
- Class 1+ primes up to 19
- Cousin primes up to 19
- Cuban primes 1 up to 19
- Cuban primes 2 up to 19
- Cullen primes up to 19
- Dihedral primes up to 19
- Double mersenne primes up to 19
- Emirps up to 19
- Euclid primes up to 19
- Factorial primes up to 19
- Fermat primes up to 19
- Fibonacci primes up to 19
- Genocchi primes up to 19
- Good primes up to 19
- Happy primes up to 19
- Harmonic primes up to 19
- Isolated primes up to 19
- Kynea primes up to 19
- Left-truncatable primes up to 19
- Leyland primes up to 19
- Long primes up to 19
- Lucas primes up to 19
- Lucky primes up to 19
- Mersenne primes up to 19
- Mills primes up to 19
- Multiplicative primes up to 19
- Palindromic primes up to 19
- Pierpont primes up to 19
- Pierpont primes of the 2nd kind up to 19
- Primes up to 19
- Prime quadruplets up to 19
- Prime quintuplet 1s up to 19
- Prime quintuplet 2s up to 19
- Prime sextuplets up to 19
- Prime triplets up to 19
- Proth primes up to 19
- Pythagorean primes up to 19
- Quartan primes up to 19
- Restricted left-truncatable primes up to 19
- Restricted right-truncatable primes up to 19
- Right-truncatable primes up to 19
- Safe primes up to 19
- Semiprimes up to 19
- Sexy primes up to 19
- Sexy prime quadrupletss up to 19
- Sexy prime triplets up to 19
- Solinas primes up to 19
- Sophie germain primes up to 19
- Super primes up to 19
- Thabit primes up to 19
- Thabit primes of the 2nd kind up to 19
- Twin primes up to 19
- Two-sided primes up to 19
- Ulam primes up to 19
- Wagstaff primes up to 19
- Weakly primes up to 19
- Wedderburn-etherington primes up to 19
- Wilson primes up to 19
- Woodall primes up to 19

## First 19#

- First 19 additive primes
- First 19 bell primes
- First 19 carol primes
- First 19 centered decagonal primes
- First 19 centered heptagonal primes
- First 19 centered square primes
- First 19 centered triangular primes
- First 19 chen primes
- First 19 class 1+ primes
- First 19 cousin primes
- First 19 Cuban primes 1
- First 19 Cuban primes 2
- First 19 cullen primes
- First 19 dihedral primes
- First 19 double mersenne primes
- First 19 Emirps
- First 19 euclid primes
- First 19 factorial primes
- First 19 fermat primes
- First 19 fibonacci primes
- First 19 genocchi primes
- First 19 good primes
- First 19 happy primes
- First 19 harmonic primes
- First 19 isolated primes
- First 19 kynea primes
- First 19 left-truncatable primes
- First 19 leyland primes
- First 19 long primes
- First 19 lucas primes
- First 19 lucky primes
- First 19 mersenne primes
- First 19 mills primes
- First 19 multiplicative primes
- First 19 palindromic primes
- First 19 pierpont primes
- First 19 Pierpont primes of the 2nd kind
- First 19 primes
- First 19 prime quadruplets
- First 19 prime quintuplet 1s
- First 19 prime quintuplet 2s
- First 19 prime sextuplets
- First 19 prime triplets
- First 19 proth primes
- First 19 pythagorean primes
- First 19 quartan primes
- First 19 restricted left-truncatable primes
- First 19 restricted right-truncatable primes
- First 19 right-truncatable primes
- First 19 safe primes
- First 19 semiprimes
- First 19 sexy primes
- First 19 sexy prime quadrupletss
- First 19 sexy prime triplets
- First 19 solinas primes
- First 19 sophie germain primes
- First 19 super primes
- First 19 thabit primes
- First 19 Thabit primes of the 2nd kind
- First 19 twin primes
- First 19 two-sided primes
- First 19 ulam primes
- First 19 wagstaff primes
- First 19 weakly primes
- First 19 wedderburn-etherington primes
- First 19 wilson primes
- First 19 woodall primes