Compare 77 vs 81
| Property | 77 | 81 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 1 |
| Total factors | 2 | 4 |
| Prime factorization | 71 × 111 | 34 |
| Prime factorization | 7 × 11 | 3 × 3 × 3 × 3 |
| Divisors count | 4 | 5 |
| Divisors | 1, 7, 11, 77 | 1, 3, 9, 27, 81 |
| Number of properties | 1 | 0 |
| Semiprimes | 26th | |
| Roman numberals | LXXVII | LXXXI |
| Base 2 | 10011012 | 10100012 |
| Base 3 | 22123 | 100003 |
| Base 4 | 10314 | 11014 |
| Base 5 | 3025 | 3115 |
| Base 6 | 2056 | 2136 |
| Base 7 | 1407 | 1447 |
| Base 8 | 1158 | 1218 |
| Base 9 | 859 | 1009 |
| Base 10 | 7710 | 8110 |
| Base 11 | 7011 | 7411 |
| Base 12 | 6512 | 6912 |
| Base 13 | 5c13 | 6313 |
| Base 14 | 5714 | 5b14 |
| Base 15 | 5215 | 5615 |
| Base 16 | 4d16 | 5116 |