Compare 347 vs 521
| Property | 347 | 521 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 3471 | 5211 |
| Prime factorization | 347 | 521 |
| Divisors count | 2 | 2 |
| Divisors | 1, 347 | 1, 521 |
| Number of properties | 10 | 6 |
| Chen primes | 51st | 70th |
| Emirps | 18th | |
| Good primes | 25th | |
| Left-truncatable primes | 26th | |
| Lucas primes | 8th | |
| Primes | 69th | 98th |
| Prime triplets (1st member) | 20th | |
| Pythagorean primes | 46th | |
| Safe primes | 13th | |
| Sexy primes (1st member) | 38th | |
| Sexy prime triplets (1st member) | 18th | |
| Solinas primes | 39th | |
| Twin primes (1st member) | 21st | 25th |
| Roman numberals | CCCXLVII | DXXI |
| Base 2 | 1010110112 | 10000010012 |
| Base 3 | 1102123 | 2010223 |
| Base 4 | 111234 | 200214 |
| Base 5 | 23425 | 40415 |
| Base 6 | 13356 | 22256 |
| Base 7 | 10047 | 13437 |
| Base 8 | 5338 | 10118 |
| Base 9 | 4259 | 6389 |
| Base 10 | 34710 | 52110 |
| Base 11 | 29611 | 43411 |
| Base 12 | 24b12 | 37512 |
| Base 13 | 20913 | 31113 |
| Base 14 | 1ab14 | 29314 |
| Base 15 | 18215 | 24b15 |
| Base 16 | 15b16 | 20916 |