# Divisors of the Positive Integer 1981

1, 7, 283, 1981## Sum of all the Divisors of 1981, including itself

2272## Sum of the Proper Divisors of 1981

291## Properties of the number 1981

The integer 1981 is an**odd**number.

The integer 1981 is a

**Composite**number.

291 is

*less than*1981, so 1981 is a

**deficient**number.

## The number 1981 as a Roman Numeral

**MCMLXXXI**

## The number 1981 in various Numeral Systems

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

2: | 11110111101 |

3: | 2201101 |

4: | 132331 |

5: | 30411 |

6: | 13101 |

7: | 5530 |

8: | 3675 |

9: | 2641 |

10: | 1981 |

11: | 1541 |

12: | 1191 |

13: | B95 |

14: | A17 |

15: | 8C1 |

16: | 7BD |

17: | 6E9 |

18: | 621 |

19: | 595 |

20: | 4J1 |

21: | 4A7 |

22: | 421 |

23: | 3H3 |

24: | 3AD |

25: | 346 |

26: | 2O5 |

27: | 2JA |

28: | 2EL |

29: | 2A9 |

30: | 261 |

31: | 21S |

32: | 1TT |

33: | 1R1 |

34: | 1O9 |

35: | 1LL |

36: | 1J1 |