Compare 1661 vs 1689
| Property | 1661 | 1689 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 111 × 1511 | 31 × 5631 |
| Prime factorization | 11 × 151 | 3 × 563 |
| Divisors count | 4 | 4 |
| Divisors | 1, 11, 151, 1661 | 1, 3, 563, 1689 |
| Number of properties | 1 | 1 |
| Semiprimes | 479th | 487th |
| Roman numberals | MDCLXI | MDCLXXXIX |
| Base 2 | 110011111012 | 110100110012 |
| Base 3 | 20211123 | 20221203 |
| Base 4 | 1213314 | 1221214 |
| Base 5 | 231215 | 232245 |
| Base 6 | 114056 | 114536 |
| Base 7 | 45627 | 46327 |
| Base 8 | 31758 | 32318 |
| Base 9 | 22459 | 22769 |
| Base 10 | 166110 | 168910 |
| Base 11 | 128011 | 12a611 |
| Base 12 | b6512 | b8912 |
| Base 13 | 9aa13 | 9cc13 |
| Base 14 | 86914 | 88914 |
| Base 15 | 75b15 | 77915 |
| Base 16 | 67d16 | 69916 |