Compare 157 vs 161
| Property | 157 | 161 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 1571 | 71 × 231 |
| Prime factorization | 157 | 7 × 23 |
| Divisors count | 2 | 4 |
| Divisors | 1, 157 | 1, 7, 23, 161 |
| Number of properties | 11 | 1 |
| Additive primes | 21st | |
| Chen primes | 30th | |
| Emirps | 12th | |
| Harmonic primes | 13th | |
| Isolated primes | 14th | |
| Primes | 37th | |
| Pythagorean primes | 17th | |
| Semiprimes | 54th | |
| Sexy primes (1st member) | 22nd | |
| Sexy primes (2nd member) | 21st | |
| Sexy prime triplets (2nd member) | 12th | |
| Super primes | 12th | |
| Roman numberals | CLVII | CLXI |
| Base 2 | 100111012 | 101000012 |
| Base 3 | 122113 | 122223 |
| Base 4 | 21314 | 22014 |
| Base 5 | 11125 | 11215 |
| Base 6 | 4216 | 4256 |
| Base 7 | 3137 | 3207 |
| Base 8 | 2358 | 2418 |
| Base 9 | 1849 | 1889 |
| Base 10 | 15710 | 16110 |
| Base 11 | 13311 | 13711 |
| Base 12 | 11112 | 11512 |
| Base 13 | c113 | c513 |
| Base 14 | b314 | b714 |
| Base 15 | a715 | ab15 |
| Base 16 | 9d16 | a116 |