Compare 1991 vs 1995
| Property | 1991 | 1995 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 4 |
| Total factors | 2 | 4 |
| Prime factorization | 111 × 1811 | 31 × 51 × 71 × 191 |
| Prime factorization | 11 × 181 | 3 × 5 × 7 × 19 |
| Divisors count | 4 | 16 |
| Divisors | 1, 11, 181, 1991 | 1, 3, 5, 7, 15, 19, 21, 35, 57, 95, 105, 133, 285, 399, 665, 1995 |
| Number of properties | 1 | 0 |
| Semiprimes | 576th | |
| Roman numberals | MCMXCI | MCMXCV |
| Base 2 | 111110001112 | 111110010112 |
| Base 3 | 22012023 | 22012203 |
| Base 4 | 1330134 | 1330234 |
| Base 5 | 304315 | 304405 |
| Base 6 | 131156 | 131236 |
| Base 7 | 55437 | 55507 |
| Base 8 | 37078 | 37138 |
| Base 9 | 26529 | 26569 |
| Base 10 | 199110 | 199510 |
| Base 11 | 155011 | 155411 |
| Base 12 | 119b12 | 11a312 |
| Base 13 | ba213 | ba613 |
| Base 14 | a2314 | a2714 |
| Base 15 | 8cb15 | 8d015 |
| Base 16 | 7c716 | 7cb16 |