Compare 81 vs 86
| Property | 81 | 86 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 34 | 21 × 431 |
| Prime factorization | 3 × 3 × 3 × 3 | 2 × 43 |
| Divisors count | 5 | 4 |
| Divisors | 1, 3, 9, 27, 81 | 1, 2, 43, 86 |
| Number of properties | 0 | 1 |
| Semiprimes | 29th | |
| Roman numberals | LXXXI | LXXXVI |
| Base 2 | 10100012 | 10101102 |
| Base 3 | 100003 | 100123 |
| Base 4 | 11014 | 11124 |
| Base 5 | 3115 | 3215 |
| Base 6 | 2136 | 2226 |
| Base 7 | 1447 | 1527 |
| Base 8 | 1218 | 1268 |
| Base 9 | 1009 | 1059 |
| Base 10 | 8110 | 8610 |
| Base 11 | 7411 | 7911 |
| Base 12 | 6912 | 7212 |
| Base 13 | 6313 | 6813 |
| Base 14 | 5b14 | 6214 |
| Base 15 | 5615 | 5b15 |
| Base 16 | 5116 | 5616 |