Compare 1681 vs 1690
| Property | 1681 | 1690 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 2 | 4 |
| Prime factorization | 412 | 21 × 51 × 132 |
| Prime factorization | 41 × 41 | 2 × 5 × 13 × 13 |
| Divisors count | 3 | 12 |
| Divisors | 1, 41, 1681 | 1, 2, 5, 10, 13, 26, 65, 130, 169, 338, 845, 1690 |
| Number of properties | 1 | 0 |
| Semiprimes | 484th | |
| Roman numberals | MDCLXXXI | MDCXC |
| Base 2 | 110100100012 | 110100110102 |
| Base 3 | 20220213 | 20221213 |
| Base 4 | 1221014 | 1221224 |
| Base 5 | 232115 | 232305 |
| Base 6 | 114416 | 114546 |
| Base 7 | 46217 | 46337 |
| Base 8 | 32218 | 32328 |
| Base 9 | 22679 | 22779 |
| Base 10 | 168110 | 169010 |
| Base 11 | 129911 | 12a711 |
| Base 12 | b8112 | b8a12 |
| Base 13 | 9c413 | a0013 |
| Base 14 | 88114 | 88a14 |
| Base 15 | 77115 | 77a15 |
| Base 16 | 69116 | 69a16 |