Compare 128 vs 131
| Property | 128 | 131 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 1 | 1 |
| Total factors | 7 | 1 |
| Prime factorization | 27 | 1311 |
| Prime factorization | 2 × 2 × 2 × 2 × 2 × 2 × 2 | 131 |
| Divisors count | 8 | 2 |
| Divisors | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 131 |
| Number of properties | 0 | 12 |
| Additive primes | 17th | |
| Chen primes | 26th | |
| Cousin primes (2nd member) | 12th | |
| Isolated primes | 13th | |
| Long primes | 12th | |
| Multiplicative primes | 10th | |
| Palindromic primes | 7th | |
| Primes | 32nd | |
| Sexy primes (1st member) | 20th | |
| Solinas primes | 23rd | |
| Sophie germain primes | 12th | |
| Ulam primes | 8th | |
| Roman numberals | CXXVIII | CXXXI |
| Base 2 | 100000002 | 100000112 |
| Base 3 | 112023 | 112123 |
| Base 4 | 20004 | 20034 |
| Base 5 | 10035 | 10115 |
| Base 6 | 3326 | 3356 |
| Base 7 | 2427 | 2457 |
| Base 8 | 2008 | 2038 |
| Base 9 | 1529 | 1559 |
| Base 10 | 12810 | 13110 |
| Base 11 | 10711 | 10a11 |
| Base 12 | a812 | ab12 |
| Base 13 | 9b13 | a113 |
| Base 14 | 9214 | 9514 |
| Base 15 | 8815 | 8b15 |
| Base 16 | 8016 | 8316 |