Compare 521 vs 809
| Property | 521 | 809 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 5211 | 8091 |
| Prime factorization | 521 | 809 |
| Divisors count | 2 | 2 |
| Divisors | 1, 521 | 1, 809 |
| Number of properties | 6 | 7 |
| Additive primes | 74th | |
| Chen primes | 70th | 95th |
| Good primes | 39th | |
| Lucas primes | 8th | |
| Primes | 98th | 140th |
| Pythagorean primes | 46th | 68th |
| Solinas primes | 39th | |
| Sophie germain primes | 35th | |
| Twin primes (1st member) | 25th | 31st |
| Roman numberals | DXXI | DCCCIX |
| Base 2 | 10000010012 | 11001010012 |
| Base 3 | 2010223 | 10022223 |
| Base 4 | 200214 | 302214 |
| Base 5 | 40415 | 112145 |
| Base 6 | 22256 | 34256 |
| Base 7 | 13437 | 22347 |
| Base 8 | 10118 | 14518 |
| Base 9 | 6389 | 10889 |
| Base 10 | 52110 | 80910 |
| Base 11 | 43411 | 67611 |
| Base 12 | 37512 | 57512 |
| Base 13 | 31113 | 4a313 |
| Base 14 | 29314 | 41b14 |
| Base 15 | 24b15 | 38e15 |
| Base 16 | 20916 | 32916 |