Number info: LXXXI (roman)
Conversion
| Decimal | 81 |
| Binary | 1010001 |
| Hexadecimal | 0x51 |
| Roman | LXXXI |
Math
| Square root of | 6561 |
| Factors | 3 3 3 3 |
| The number 81 | is square of 9 |
Miscellaneous
| English | eighty-one |
| Wikipedia article about 81 | Article about 81 |
| ASCII code for | Uppercase Q |
| The number 81 is a power of | 3 |
| The number 81 is a power of | 9 |
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