Compare 397 vs 421
| Property | 397 | 421 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 3971 | 4211 |
| Prime factorization | 397 | 421 |
| Divisors count | 2 | 2 |
| Divisors | 1, 397 | 1, 421 |
| Number of properties | 8 | 6 |
| Additive primes | 45th | 48th |
| Centered square primes | 8th | |
| Cousin primes (1st member) | 22nd | |
| Cuban primes 1 | 8th | |
| Happy primes | 21st | |
| Isolated primes | 37th | |
| Left-truncatable primes | 31st | |
| Lucky primes | 23rd | |
| Primes | 78th | 82nd |
| Pythagorean primes | 37th | 40th |
| Twin primes (2nd member) | 22nd | |
| Roman numberals | CCCXCVII | CDXXI |
| Base 2 | 1100011012 | 1101001012 |
| Base 3 | 1122013 | 1201213 |
| Base 4 | 120314 | 122114 |
| Base 5 | 30425 | 31415 |
| Base 6 | 15016 | 15416 |
| Base 7 | 11057 | 11417 |
| Base 8 | 6158 | 6458 |
| Base 9 | 4819 | 5179 |
| Base 10 | 39710 | 42110 |
| Base 11 | 33111 | 35311 |
| Base 12 | 29112 | 2b112 |
| Base 13 | 24713 | 26513 |
| Base 14 | 20514 | 22114 |
| Base 15 | 1b715 | 1d115 |
| Base 16 | 18d16 | 1a516 |