Compare 631 vs 640
| Property | 631 | 640 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 2 |
| Total factors | 1 | 8 |
| Prime factorization | 6311 | 27 × 51 |
| Prime factorization | 631 | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 |
| Divisors count | 2 | 16 |
| Divisors | 1, 631 | 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640 |
| 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 | DCXL |
| Base 2 | 10011101112 | 10100000002 |
| Base 3 | 2121013 | 2122013 |
| Base 4 | 213134 | 220004 |
| Base 5 | 100115 | 100305 |
| Base 6 | 25316 | 25446 |
| Base 7 | 15617 | 16037 |
| Base 8 | 11678 | 12008 |
| Base 9 | 7719 | 7819 |
| Base 10 | 63110 | 64010 |
| Base 11 | 52411 | 53211 |
| Base 12 | 44712 | 45412 |
| Base 13 | 39713 | 3a313 |
| Base 14 | 33114 | 33a14 |
| Base 15 | 2c115 | 2ca15 |
| Base 16 | 27716 | 28016 |