Compare 634 vs 643
| Property | 634 | 643 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 21 × 3171 | 6431 |
| Prime factorization | 2 × 317 | 643 |
| Divisors count | 4 | 2 |
| Divisors | 1, 2, 317, 634 | 1, 643 |
| Number of properties | 1 | 7 |
| Additive primes | 63rd | |
| Cousin primes (1st member) | 29th | |
| Left-truncatable primes | 38th | |
| Lucky primes | 33rd | |
| Primes | 117th | |
| Prime triplets (2nd member) | 24th | |
| Semiprimes | 194th | |
| Twin primes (2nd member) | 29th | |
| Roman numberals | DCXXXIV | DCXLIII |
| Base 2 | 10011110102 | 10100000112 |
| Base 3 | 2121113 | 2122113 |
| Base 4 | 213224 | 220034 |
| Base 5 | 100145 | 100335 |
| Base 6 | 25346 | 25516 |
| Base 7 | 15647 | 16067 |
| Base 8 | 11728 | 12038 |
| Base 9 | 7749 | 7849 |
| Base 10 | 63410 | 64310 |
| Base 11 | 52711 | 53511 |
| Base 12 | 44a12 | 45712 |
| Base 13 | 39a13 | 3a613 |
| Base 14 | 33414 | 33d14 |
| Base 15 | 2c415 | 2cd15 |
| Base 16 | 27a16 | 28316 |