Compare 519 vs 521
| Property | 519 | 521 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 31 × 1731 | 5211 |
| Prime factorization | 3 × 173 | 521 |
| Divisors count | 4 | 2 |
| Divisors | 1, 3, 173, 519 | 1, 521 |
| Number of properties | 1 | 6 |
| Chen primes | 70th | |
| Lucas primes | 8th | |
| Primes | 98th | |
| Pythagorean primes | 46th | |
| Semiprimes | 161st | |
| Solinas primes | 39th | |
| Twin primes (1st member) | 25th | |
| Roman numberals | DXIX | DXXI |
| Base 2 | 10000001112 | 10000010012 |
| Base 3 | 2010203 | 2010223 |
| Base 4 | 200134 | 200214 |
| Base 5 | 40345 | 40415 |
| Base 6 | 22236 | 22256 |
| Base 7 | 13417 | 13437 |
| Base 8 | 10078 | 10118 |
| Base 9 | 6369 | 6389 |
| Base 10 | 51910 | 52110 |
| Base 11 | 43211 | 43411 |
| Base 12 | 37312 | 37512 |
| Base 13 | 30c13 | 31113 |
| Base 14 | 29114 | 29314 |
| Base 15 | 24915 | 24b15 |
| Base 16 | 20716 | 20916 |