Compare 397 vs 521
| Property | 397 | 521 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 3971 | 5211 |
| Prime factorization | 397 | 521 |
| Divisors count | 2 | 2 |
| Divisors | 1, 397 | 1, 521 |
| Number of properties | 8 | 6 |
| Additive primes | 45th | |
| Chen primes | 70th | |
| Cousin primes (1st member) | 22nd | |
| Cuban primes 1 | 8th | |
| Happy primes | 21st | |
| Isolated primes | 37th | |
| Left-truncatable primes | 31st | |
| Lucas primes | 8th | |
| Primes | 78th | 98th |
| Pythagorean primes | 37th | 46th |
| Solinas primes | 39th | |
| Twin primes (1st member) | 25th | |
| Roman numberals | CCCXCVII | DXXI |
| Base 2 | 1100011012 | 10000010012 |
| Base 3 | 1122013 | 2010223 |
| Base 4 | 120314 | 200214 |
| Base 5 | 30425 | 40415 |
| Base 6 | 15016 | 22256 |
| Base 7 | 11057 | 13437 |
| Base 8 | 6158 | 10118 |
| Base 9 | 4819 | 6389 |
| Base 10 | 39710 | 52110 |
| Base 11 | 33111 | 43411 |
| Base 12 | 29112 | 37512 |
| Base 13 | 24713 | 31113 |
| Base 14 | 20514 | 29314 |
| Base 15 | 1b715 | 24b15 |
| Base 16 | 18d16 | 20916 |