Compare 331 vs 397
| Property | 331 | 397 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 3311 | 3971 |
| Prime factorization | 331 | 397 |
| Divisors count | 2 | 2 |
| Divisors | 1, 331 | 1, 397 |
| Number of properties | 10 | 8 |
| Additive primes | 39th | 45th |
| Cousin primes (1st member) | 22nd | |
| Cuban primes 1 | 7th | 8th |
| Good primes | 24th | |
| Happy primes | 17th | 21st |
| Harmonic primes | 28th | |
| Isolated primes | 28th | 37th |
| Left-truncatable primes | 31st | |
| Lucky primes | 19th | |
| Primes | 67th | 78th |
| Pythagorean primes | 37th | |
| Sexy primes (1st member) | 37th | |
| Super primes | 19th | |
| Roman numberals | CCCXXXI | CCCXCVII |
| Base 2 | 1010010112 | 1100011012 |
| Base 3 | 1100213 | 1122013 |
| Base 4 | 110234 | 120314 |
| Base 5 | 23115 | 30425 |
| Base 6 | 13116 | 15016 |
| Base 7 | 6527 | 11057 |
| Base 8 | 5138 | 6158 |
| Base 9 | 4079 | 4819 |
| Base 10 | 33110 | 39710 |
| Base 11 | 28111 | 33111 |
| Base 12 | 23712 | 29112 |
| Base 13 | 1c613 | 24713 |
| Base 14 | 19914 | 20514 |
| Base 15 | 17115 | 1b715 |
| Base 16 | 14b16 | 18d16 |