Compare 397 vs 491
| Property | 397 | 491 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 3971 | 4911 |
| Prime factorization | 397 | 491 |
| Divisors count | 2 | 2 |
| Divisors | 1, 397 | 1, 491 |
| Number of properties | 8 | 7 |
| Additive primes | 45th | |
| Chen primes | 66th | |
| Cousin primes (1st member) | 22nd | |
| Cousin primes (2nd member) | 26th | |
| Cuban primes 1 | 8th | |
| Happy primes | 21st | |
| Harmonic primes | 38th | |
| Isolated primes | 37th | 47th |
| Left-truncatable primes | 31st | |
| Long primes | 34th | |
| Primes | 78th | 94th |
| Pythagorean primes | 37th | |
| Sophie germain primes | 25th | |
| Roman numberals | CCCXCVII | CDXCI |
| Base 2 | 1100011012 | 1111010112 |
| Base 3 | 1122013 | 2000123 |
| Base 4 | 120314 | 132234 |
| Base 5 | 30425 | 34315 |
| Base 6 | 15016 | 21356 |
| Base 7 | 11057 | 13017 |
| Base 8 | 6158 | 7538 |
| Base 9 | 4819 | 6059 |
| Base 10 | 39710 | 49110 |
| Base 11 | 33111 | 40711 |
| Base 12 | 29112 | 34b12 |
| Base 13 | 24713 | 2ba13 |
| Base 14 | 20514 | 27114 |
| Base 15 | 1b715 | 22b15 |
| Base 16 | 18d16 | 1eb16 |