Compare 631 vs 643
| Property | 631 | 643 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 6311 | 6431 |
| Prime factorization | 631 | 643 |
| Divisors count | 2 | 2 |
| Divisors | 1, 631 | 1, 643 |
| Number of properties | 6 | 7 |
| Additive primes | 63rd | |
| Centered triangular primes | 7th | |
| Chen primes | 80th | |
| Cousin primes (1st member) | 29th | |
| Cuban primes 1 | 10th | |
| Isolated primes | 60th | |
| Left-truncatable primes | 38th | |
| Lucky primes | 32nd | 33rd |
| Primes | 115th | 117th |
| Prime triplets (2nd member) | 24th | |
| Twin primes (2nd member) | 29th | |
| Roman numberals | DCXXXI | DCXLIII |
| Base 2 | 10011101112 | 10100000112 |
| Base 3 | 2121013 | 2122113 |
| Base 4 | 213134 | 220034 |
| Base 5 | 100115 | 100335 |
| Base 6 | 25316 | 25516 |
| Base 7 | 15617 | 16067 |
| Base 8 | 11678 | 12038 |
| Base 9 | 7719 | 7849 |
| Base 10 | 63110 | 64310 |
| Base 11 | 52411 | 53511 |
| Base 12 | 44712 | 45712 |
| Base 13 | 39713 | 3a613 |
| Base 14 | 33114 | 33d14 |
| Base 15 | 2c115 | 2cd15 |
| Base 16 | 27716 | 28316 |