Compare 91 vs 121
| Property | 91 | 121 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 2 |
| Prime factorization | 71 × 131 | 112 |
| Prime factorization | 7 × 13 | 11 × 11 |
| Divisors count | 4 | 3 |
| Divisors | 1, 7, 13, 91 | 1, 11, 121 |
| Number of properties | 1 | 1 |
| Semiprimes | 31st | 40th |
| Roman numberals | XCI | CXXI |
| Base 2 | 10110112 | 11110012 |
| Base 3 | 101013 | 111113 |
| Base 4 | 11234 | 13214 |
| Base 5 | 3315 | 4415 |
| Base 6 | 2316 | 3216 |
| Base 7 | 1607 | 2327 |
| Base 8 | 1338 | 1718 |
| Base 9 | 1119 | 1449 |
| Base 10 | 9110 | 12110 |
| Base 11 | 8311 | 10011 |
| Base 12 | 7712 | a112 |
| Base 13 | 7013 | 9413 |
| Base 14 | 6714 | 8914 |
| Base 15 | 6115 | 8115 |
| Base 16 | 5b16 | 7916 |