Compare 520 vs 521
| Property | 520 | 521 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 5 | 1 |
| Prime factorization | 23 × 51 × 131 | 5211 |
| Prime factorization | 2 × 2 × 2 × 5 × 13 | 521 |
| Divisors count | 16 | 2 |
| Divisors | 1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520 | 1, 521 |
| Number of properties | 0 | 6 |
| Chen primes | 70th | |
| Lucas primes | 8th | |
| Primes | 98th | |
| Pythagorean primes | 46th | |
| Solinas primes | 39th | |
| Twin primes (1st member) | 25th | |
| Roman numberals | DXX | DXXI |
| Base 2 | 10000010002 | 10000010012 |
| Base 3 | 2010213 | 2010223 |
| Base 4 | 200204 | 200214 |
| Base 5 | 40405 | 40415 |
| Base 6 | 22246 | 22256 |
| Base 7 | 13427 | 13437 |
| Base 8 | 10108 | 10118 |
| Base 9 | 6379 | 6389 |
| Base 10 | 52010 | 52110 |
| Base 11 | 43311 | 43411 |
| Base 12 | 37412 | 37512 |
| Base 13 | 31013 | 31113 |
| Base 14 | 29214 | 29314 |
| Base 15 | 24a15 | 24b15 |
| Base 16 | 20816 | 20916 |