Compare 81 vs 82
| Property | 81 | 82 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 34 | 21 × 411 |
| Prime factorization | 3 × 3 × 3 × 3 | 2 × 41 |
| Divisors count | 5 | 4 |
| Divisors | 1, 3, 9, 27, 81 | 1, 2, 41, 82 |
| Number of properties | 0 | 1 |
| Semiprimes | 27th | |
| Roman numberals | LXXXI | LXXXII |
| Base 2 | 10100012 | 10100102 |
| Base 3 | 100003 | 100013 |
| Base 4 | 11014 | 11024 |
| Base 5 | 3115 | 3125 |
| Base 6 | 2136 | 2146 |
| Base 7 | 1447 | 1457 |
| Base 8 | 1218 | 1228 |
| Base 9 | 1009 | 1019 |
| Base 10 | 8110 | 8210 |
| Base 11 | 7411 | 7511 |
| Base 12 | 6912 | 6a12 |
| Base 13 | 6313 | 6413 |
| Base 14 | 5b14 | 5c14 |
| Base 15 | 5615 | 5715 |
| Base 16 | 5116 | 5216 |