Compare 637 vs 643
| Property | 637 | 643 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 72 × 131 | 6431 |
| Prime factorization | 7 × 7 × 13 | 643 |
| Divisors count | 6 | 2 |
| Divisors | 1, 7, 13, 49, 91, 637 | 1, 643 |
| Number of properties | 0 | 7 |
| Additive primes | 63rd | |
| Cousin primes (1st member) | 29th | |
| Left-truncatable primes | 38th | |
| Lucky primes | 33rd | |
| Primes | 117th | |
| Prime triplets (2nd member) | 24th | |
| Twin primes (2nd member) | 29th | |
| Roman numberals | DCXXXVII | DCXLIII |
| Base 2 | 10011111012 | 10100000112 |
| Base 3 | 2121213 | 2122113 |
| Base 4 | 213314 | 220034 |
| Base 5 | 100225 | 100335 |
| Base 6 | 25416 | 25516 |
| Base 7 | 16007 | 16067 |
| Base 8 | 11758 | 12038 |
| Base 9 | 7779 | 7849 |
| Base 10 | 63710 | 64310 |
| Base 11 | 52a11 | 53511 |
| Base 12 | 45112 | 45712 |
| Base 13 | 3a013 | 3a613 |
| Base 14 | 33714 | 33d14 |
| Base 15 | 2c715 | 2cd15 |
| Base 16 | 27d16 | 28316 |