Divisors of the Positive Integer 81
1, 3, 9, 27, 81Sum of all the Divisors of 81, including itself
121Sum of the Proper Divisors of 81
40Properties of the number 81
The integer 81 is an odd number.The integer 81 is a Composite number.
40 is less than 81, so 81 is a deficient number.
The number 81 as a Roman Numeral
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The number 81 in various Numeral Systems
| Base | Representation |
|---|---|
| 2: | 1010001 |
| 3: | 10000 |
| 4: | 1101 |
| 5: | 311 |
| 6: | 213 |
| 7: | 144 |
| 8: | 121 |
| 9: | 100 |
| 10: | 81 |
| 11: | 74 |
| 12: | 69 |
| 13: | 63 |
| 14: | 5B |
| 15: | 56 |
| 16: | 51 |
| 17: | 4D |
| 18: | 49 |
| 19: | 45 |
| 20: | 41 |
| 21: | 3I |
| 22: | 3F |
| 23: | 3C |
| 24: | 39 |
| 25: | 36 |
| 26: | 33 |
| 27: | 30 |
| 28: | 2P |
| 29: | 2N |
| 30: | 2L |
| 31: | 2J |
| 32: | 2H |
| 33: | 2F |
| 34: | 2D |
| 35: | 2B |
| 36: | 29 |