Compare 81 vs 89
| Property | 81 | 89 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 1 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 34 | 891 |
| Prime factorization | 3 × 3 × 3 × 3 | 89 |
| Divisors count | 5 | 2 |
| Divisors | 1, 3, 9, 27, 81 | 1, 89 |
| Number of properties | 0 | 8 |
| Additive primes | 14th | |
| Chen primes | 20th | |
| Fibonacci primes | 5th | |
| Isolated primes | 9th | |
| Primes | 24th | |
| Pythagorean primes | 10th | |
| Sexy primes (2nd member) | 15th | |
| Sophie germain primes | 10th | |
| Roman numberals | LXXXI | LXXXIX |
| Base 2 | 10100012 | 10110012 |
| Base 3 | 100003 | 100223 |
| Base 4 | 11014 | 11214 |
| Base 5 | 3115 | 3245 |
| Base 6 | 2136 | 2256 |
| Base 7 | 1447 | 1557 |
| Base 8 | 1218 | 1318 |
| Base 9 | 1009 | 1089 |
| Base 10 | 8110 | 8910 |
| Base 11 | 7411 | 8111 |
| Base 12 | 6912 | 7512 |
| Base 13 | 6313 | 6b13 |
| Base 14 | 5b14 | 6514 |
| Base 15 | 5615 | 5e15 |
| Base 16 | 5116 | 5916 |