Compare 521 vs 531
| Property | 521 | 531 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 2 |
| Total factors | 1 | 3 |
| Prime factorization | 5211 | 32 × 591 |
| Prime factorization | 521 | 3 × 3 × 59 |
| Divisors count | 2 | 6 |
| Divisors | 1, 521 | 1, 3, 9, 59, 177, 531 |
| Number of properties | 6 | 0 |
| Chen primes | 70th | |
| Lucas primes | 8th | |
| Primes | 98th | |
| Pythagorean primes | 46th | |
| Solinas primes | 39th | |
| Twin primes (1st member) | 25th | |
| Roman numberals | DXXI | DXXXI |
| Base 2 | 10000010012 | 10000100112 |
| Base 3 | 2010223 | 2012003 |
| Base 4 | 200214 | 201034 |
| Base 5 | 40415 | 41115 |
| Base 6 | 22256 | 22436 |
| Base 7 | 13437 | 13567 |
| Base 8 | 10118 | 10238 |
| Base 9 | 6389 | 6509 |
| Base 10 | 52110 | 53110 |
| Base 11 | 43411 | 44311 |
| Base 12 | 37512 | 38312 |
| Base 13 | 31113 | 31b13 |
| Base 14 | 29314 | 29d14 |
| Base 15 | 24b15 | 25615 |
| Base 16 | 20916 | 21316 |