Number 81
Prime factorization
Basic properties
| Is prime? |
× NO
|
| Previous integer | 80 |
| Next integer | 82 |
| Previous prime number | 79 |
| Next prime number | 89 |
| Reciprocal | 0.012345679012345 |
| Square | 6561 |
| Square root | 9 |
| Natural logarithm | 4.394449154672439 |
| Decimal logarithm | 1.90848501887865 |
| Sine | -0.6298879942744539 |
| Cosine | 0.7766859820216312 |
| Tangent | -0.8109944158318942 |
Expressions
| Binary | 1010001 |
| Octal | 121 |
| Hexadecimal | 51 |