Compare 1645 vs 1657
| Property | 1645 | 1657 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 51 × 71 × 471 | 16571 |
| Prime factorization | 5 × 7 × 47 | 1657 |
| Divisors count | 8 | 2 |
| Divisors | 1, 5, 7, 35, 47, 235, 329, 1645 | 1, 1657 |
| Number of properties | 0 | 8 |
| Additive primes | 139th | |
| Cuban primes 1 | 12th | |
| Emirps | 80th | |
| Isolated primes | 157th | |
| Primes | 260th | |
| Pythagorean primes | 125th | |
| Sexy primes (1st member) | 112th | |
| Sexy prime triplets (1st member) | 43rd | |
| Roman numberals | MDCXLV | MDCLVII |
| Base 2 | 110011011012 | 110011110012 |
| Base 3 | 20202213 | 20211013 |
| Base 4 | 1212314 | 1213214 |
| Base 5 | 230405 | 231125 |
| Base 6 | 113416 | 114016 |
| Base 7 | 45407 | 45557 |
| Base 8 | 31558 | 31718 |
| Base 9 | 22279 | 22419 |
| Base 10 | 164510 | 165710 |
| Base 11 | 126611 | 127711 |
| Base 12 | b5112 | b6112 |
| Base 13 | 99713 | 9a613 |
| Base 14 | 85714 | 86514 |
| Base 15 | 74a15 | 75715 |
| Base 16 | 66d16 | 67916 |