# Compare 191 vs 521

Property | 191 | 521 |
---|---|---|

Type | prime | prime |

Unique factors | 1 | 1 |

Total factors | 1 | 1 |

Prime factorization | 191^{1} | 521^{1} |

Prime factorization | 191 | 521 |

Divisors count | 2 | 2 |

Divisors | 1, 191 | 1, 521 |

Number of properties | 16 | 6 |

Additive primes | 24th | |

Chen primes | 34th | 70th |

Class 1+ primes | 14th | |

Good primes | 16th | |

Harmonic primes | 15th | |

Lucas primes | 8th | |

Palindromic primes | 10th | |

Pierpont primes of the 2nd kind | 14th | |

Primes | 43rd | 98th |

Prime quadruplets (1st member) | 4th | |

Prime triplets (1st member) | 13th | |

Pythagorean primes | 46th | |

Sexy primes (1st member) | 25th | |

Solinas primes | 25th | 39th |

Sophie germain primes | 15th | |

Super primes | 14th | |

Thabit primes | 6th | |

Twin primes (1st member) | 14th | 25th |

Roman numberals | CXCI | DXXI |

Base 2 | 10111111_{2} | 1000001001_{2} |

Base 3 | 21002_{3} | 201022_{3} |

Base 4 | 2333_{4} | 20021_{4} |

Base 5 | 1231_{5} | 4041_{5} |

Base 6 | 515_{6} | 2225_{6} |

Base 7 | 362_{7} | 1343_{7} |

Base 8 | 277_{8} | 1011_{8} |

Base 9 | 232_{9} | 638_{9} |

Base 10 | 191_{10} | 521_{10} |

Base 11 | 164_{11} | 434_{11} |

Base 12 | 13b_{12} | 375_{12} |

Base 13 | 119_{13} | 311_{13} |

Base 14 | d9_{14} | 293_{14} |

Base 15 | cb_{15} | 24b_{15} |

Base 16 | bf_{16} | 209_{16} |