Compare 91 vs 99
| Property | 91 | 99 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 2 |
| Total factors | 2 | 3 |
| Prime factorization | 71 × 131 | 32 × 111 |
| Prime factorization | 7 × 13 | 3 × 3 × 11 |
| Divisors count | 4 | 6 |
| Divisors | 1, 7, 13, 91 | 1, 3, 9, 11, 33, 99 |
| Number of properties | 1 | 0 |
| Semiprimes | 31st | |
| Roman numberals | XCI | XCIX |
| Base 2 | 10110112 | 11000112 |
| Base 3 | 101013 | 102003 |
| Base 4 | 11234 | 12034 |
| Base 5 | 3315 | 3445 |
| Base 6 | 2316 | 2436 |
| Base 7 | 1607 | 2017 |
| Base 8 | 1338 | 1438 |
| Base 9 | 1119 | 1209 |
| Base 10 | 9110 | 9910 |
| Base 11 | 8311 | 9011 |
| Base 12 | 7712 | 8312 |
| Base 13 | 7013 | 7813 |
| Base 14 | 6714 | 7114 |
| Base 15 | 6115 | 6915 |
| Base 16 | 5b16 | 6316 |