# Divisors of the Positive Integer 1991

1, 11, 181, 1991## Sum of all the Divisors of 1991, including itself

2184## Sum of the Proper Divisors of 1991

193## Properties of the number 1991

The integer 1991 is an**odd**number.

The integer 1991 is a

**Composite**number.

193 is

*less than*1991, so 1991 is a

**deficient**number.

## The number 1991 as a Roman Numeral

**MCMXCI**

## The number 1991 in various Numeral Systems

Base |
Representation |
---|---|

2: | 11111000111 |

3: | 2201202 |

4: | 133013 |

5: | 30431 |

6: | 13115 |

7: | 5543 |

8: | 3707 |

9: | 2652 |

10: | 1991 |

11: | 1550 |

12: | 119B |

13: | BA2 |

14: | A23 |

15: | 8CB |

16: | 7C7 |

17: | 6F2 |

18: | 62B |

19: | 59F |

20: | 4JB |

21: | 4AH |

22: | 42B |

23: | 3HD |

24: | 3AN |

25: | 34G |

26: | 2OF |

27: | 2JK |

28: | 2F3 |

29: | 2AJ |

30: | 26B |

31: | 227 |

32: | 1U7 |

33: | 1RB |

34: | 1OJ |

35: | 1LV |

36: | 1JB |