Compare 155 vs 157
| Property | 155 | 157 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 311 | 1571 |
| Prime factorization | 5 × 31 | 157 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 31, 155 | 1, 157 |
| Number of properties | 1 | 11 |
| Additive primes | 21st | |
| Chen primes | 30th | |
| Emirps | 12th | |
| Harmonic primes | 13th | |
| Isolated primes | 14th | |
| Primes | 37th | |
| Pythagorean primes | 17th | |
| Semiprimes | 51st | |
| Sexy primes (1st member) | 22nd | |
| Sexy primes (2nd member) | 21st | |
| Sexy prime triplets (2nd member) | 12th | |
| Super primes | 12th | |
| Roman numberals | CLV | CLVII |
| Base 2 | 100110112 | 100111012 |
| Base 3 | 122023 | 122113 |
| Base 4 | 21234 | 21314 |
| Base 5 | 11105 | 11125 |
| Base 6 | 4156 | 4216 |
| Base 7 | 3117 | 3137 |
| Base 8 | 2338 | 2358 |
| Base 9 | 1829 | 1849 |
| Base 10 | 15510 | 15710 |
| Base 11 | 13111 | 13311 |
| Base 12 | 10b12 | 11112 |
| Base 13 | bc13 | c113 |
| Base 14 | b114 | b314 |
| Base 15 | a515 | a715 |
| Base 16 | 9b16 | 9d16 |