Compare 1991 vs 2038
| Property | 1991 | 2038 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 111 × 1811 | 21 × 10191 |
| Prime factorization | 11 × 181 | 2 × 1019 |
| Divisors count | 4 | 4 |
| Divisors | 1, 11, 181, 1991 | 1, 2, 1019, 2038 |
| Number of properties | 1 | 1 |
| Semiprimes | 576th | 585th |
| Roman numberals | MCMXCI | MMXXXVIII |
| Base 2 | 111110001112 | 111111101102 |
| Base 3 | 22012023 | 22101113 |
| Base 4 | 1330134 | 1333124 |
| Base 5 | 304315 | 311235 |
| Base 6 | 131156 | 132346 |
| Base 7 | 55437 | 56417 |
| Base 8 | 37078 | 37668 |
| Base 9 | 26529 | 27149 |
| Base 10 | 199110 | 203810 |
| Base 11 | 155011 | 159311 |
| Base 12 | 119b12 | 121a12 |
| Base 13 | ba213 | c0a13 |
| Base 14 | a2314 | a5814 |
| Base 15 | 8cb15 | 90d15 |
| Base 16 | 7c716 | 7f616 |