Compare 1641 vs 1661
| Property | 1641 | 1661 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 31 × 5471 | 111 × 1511 |
| Prime factorization | 3 × 547 | 11 × 151 |
| Divisors count | 4 | 4 |
| Divisors | 1, 3, 547, 1641 | 1, 11, 151, 1661 |
| Number of properties | 1 | 1 |
| Semiprimes | 470th | 479th |
| Roman numberals | MDCXLI | MDCLXI |
| Base 2 | 110011010012 | 110011111012 |
| Base 3 | 20202103 | 20211123 |
| Base 4 | 1212214 | 1213314 |
| Base 5 | 230315 | 231215 |
| Base 6 | 113336 | 114056 |
| Base 7 | 45337 | 45627 |
| Base 8 | 31518 | 31758 |
| Base 9 | 22239 | 22459 |
| Base 10 | 164110 | 166110 |
| Base 11 | 126211 | 128011 |
| Base 12 | b4912 | b6512 |
| Base 13 | 99313 | 9aa13 |
| Base 14 | 85314 | 86914 |
| Base 15 | 74615 | 75b15 |
| Base 16 | 66916 | 67d16 |