# Compare 18 vs 19

Property | 18 | 19 |
---|---|---|

Type | composite number | prime |

Unique factors | 2 | 1 |

Total factors | 3 | 1 |

Prime factorization | 2^{1} × 3^{2} | 19^{1} |

Prime factorization | 2 × 3 × 3 | 19 |

Divisors count | 6 | 2 |

Divisors | 1, 2, 3, 6, 9, 18 | 1, 19 |

Number of properties | 0 | 18 |

Centered triangular primes | 1st | |

Chen primes | 8th | |

Cousin primes (1st member) | 4th | |

Cuban primes 1 | 2nd | |

Happy primes | 3rd | |

Long primes | 3rd | |

Pierpont primes | 7th | |

Primes | 8th | |

Prime quadruplets (4th member) | 2nd | |

Prime quintuplet 1s (5th member) | 1st | |

Prime quintuplet 2s (4th member) | 2nd | |

Prime sextuplets (5th member) | 1st | |

Prime triplets (2nd member) | 5th | |

Prime triplets (3rd member) | 4th | |

Sexy primes (2nd member) | 4th | |

Sexy prime triplets (3rd member) | 2nd | |

Solinas primes | 7th | |

Twin primes (2nd member) | 4th | |

Roman numberals | XVIII | XIX |

Base 2 | 10010_{2} | 10011_{2} |

Base 3 | 200_{3} | 201_{3} |

Base 4 | 102_{4} | 103_{4} |

Base 5 | 33_{5} | 34_{5} |

Base 6 | 30_{6} | 31_{6} |

Base 7 | 24_{7} | 25_{7} |

Base 8 | 22_{8} | 23_{8} |

Base 9 | 20_{9} | 21_{9} |

Base 10 | 18_{10} | 19_{10} |

Base 11 | 17_{11} | 18_{11} |

Base 12 | 16_{12} | 17_{12} |

Base 13 | 15_{13} | 16_{13} |

Base 14 | 14_{14} | 15_{14} |

Base 15 | 13_{15} | 14_{15} |

Base 16 | 12_{16} | 13_{16} |