Compare 631 vs 639
| Property | 631 | 639 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 2 |
| Total factors | 1 | 3 |
| Prime factorization | 6311 | 32 × 711 |
| Prime factorization | 631 | 3 × 3 × 71 |
| Divisors count | 2 | 6 |
| Divisors | 1, 631 | 1, 3, 9, 71, 213, 639 |
| Number of properties | 6 | 0 |
| Centered triangular primes | 7th | |
| Chen primes | 80th | |
| Cuban primes 1 | 10th | |
| Isolated primes | 60th | |
| Lucky primes | 32nd | |
| Primes | 115th | |
| Roman numberals | DCXXXI | DCXXXIX |
| Base 2 | 10011101112 | 10011111112 |
| Base 3 | 2121013 | 2122003 |
| Base 4 | 213134 | 213334 |
| Base 5 | 100115 | 100245 |
| Base 6 | 25316 | 25436 |
| Base 7 | 15617 | 16027 |
| Base 8 | 11678 | 11778 |
| Base 9 | 7719 | 7809 |
| Base 10 | 63110 | 63910 |
| Base 11 | 52411 | 53111 |
| Base 12 | 44712 | 45312 |
| Base 13 | 39713 | 3a213 |
| Base 14 | 33114 | 33914 |
| Base 15 | 2c115 | 2c915 |
| Base 16 | 27716 | 27f16 |