# Compare 31 vs 45

Property | 31 | 45 |
---|---|---|

Type | prime | composite number |

Unique factors | 1 | 2 |

Total factors | 1 | 3 |

Prime factorization | 31^{1} | 3^{2} × 5^{1} |

Prime factorization | 31 | 3 × 3 × 5 |

Divisors count | 2 | 6 |

Divisors | 1, 31 | 1, 3, 5, 9, 15, 45 |

Number of properties | 18 | 0 |

Centered decagonal primes | 2nd | |

Centered triangular primes | 2nd | |

Chen primes | 11th | |

Class 1+ primes | 8th | |

Emirps | 3rd | |

Euclid primes | 4th | |

Happy primes | 5th | |

Lucky primes | 4th | |

Mersenne primes | 3rd | |

Multiplicative primes | 7th | |

Pierpont primes of the 2nd kind | 8th | |

Primes | 11th | |

Right-truncatable primes | 7th | |

Sexy primes (1st member) | 7th | |

Sexy prime triplets (1st member) | 5th | |

Solinas primes | 10th | |

Super primes | 5th | |

Twin primes (2nd member) | 5th | |

Roman numberals | XXXI | XLV |

Base 2 | 11111_{2} | 101101_{2} |

Base 3 | 1011_{3} | 1200_{3} |

Base 4 | 133_{4} | 231_{4} |

Base 5 | 111_{5} | 140_{5} |

Base 6 | 51_{6} | 113_{6} |

Base 7 | 43_{7} | 63_{7} |

Base 8 | 37_{8} | 55_{8} |

Base 9 | 34_{9} | 50_{9} |

Base 10 | 31_{10} | 45_{10} |

Base 11 | 29_{11} | 41_{11} |

Base 12 | 27_{12} | 39_{12} |

Base 13 | 25_{13} | 36_{13} |

Base 14 | 23_{14} | 33_{14} |

Base 15 | 21_{15} | 30_{15} |

Base 16 | 1f_{16} | 2d_{16} |