Compare 640261 vs 640271
| Property | 640261 | 640271 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 6402611 | 171 × 376631 |
| Prime factorization | 640261 | 17 × 37663 |
| Divisors count | 2 | 4 |
| Divisors | 1, 640261 | 1, 17, 37663, 640271 |
| Number of properties | 5 | 1 |
| Additive primes | 20363rd | |
| Lucky primes | 5980th | |
| Primes | 52100th | |
| Semiprimes | 137197th | |
| Sexy primes (1st member) | 11288th | |
| Twin primes (2nd member) | 5636th | |
| Roman numberals | ||
| Base 2 | 100111000101000001012 | 100111000101000011112 |
| Base 3 | 10121120211013 | 10121120212023 |
| Base 4 | 21301100114 | 21301100334 |
| Base 5 | 1304420215 | 1304420415 |
| Base 6 | 214201016 | 214201156 |
| Base 7 | 53044367 | 53044527 |
| Base 8 | 23424058 | 23424178 |
| Base 9 | 11752419 | 11752529 |
| Base 10 | 64026110 | 64027110 |
| Base 11 | 3a804611 | 3a805511 |
| Base 12 | 26a63112 | 26a63b12 |
| Base 13 | 19556b13 | 19557813 |
| Base 14 | 12948d14 | 12949914 |
| Base 15 | c9a9115 | c9a9b15 |
| Base 16 | 9c50516 | 9c50f16 |