Compare 640261 vs 640265
| Property | 640261 | 640265 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 6402611 | 51 × 1280531 |
| Prime factorization | 640261 | 5 × 128053 |
| Divisors count | 2 | 4 |
| Divisors | 1, 640261 | 1, 5, 128053, 640265 |
| Number of properties | 5 | 1 |
| Additive primes | 20363rd | |
| Lucky primes | 5980th | |
| Primes | 52100th | |
| Semiprimes | 137196th | |
| Sexy primes (1st member) | 11288th | |
| Twin primes (2nd member) | 5636th | |
| Roman numberals | ||
| Base 2 | 100111000101000001012 | 100111000101000010012 |
| Base 3 | 10121120211013 | 10121120211123 |
| Base 4 | 21301100114 | 21301100214 |
| Base 5 | 1304420215 | 1304420305 |
| Base 6 | 214201016 | 214201056 |
| Base 7 | 53044367 | 53044437 |
| Base 8 | 23424058 | 23424118 |
| Base 9 | 11752419 | 11752459 |
| Base 10 | 64026110 | 64026510 |
| Base 11 | 3a804611 | 3a804a11 |
| Base 12 | 26a63112 | 26a63512 |
| Base 13 | 19556b13 | 19557213 |
| Base 14 | 12948d14 | 12949314 |
| Base 15 | c9a9115 | c9a9515 |
| Base 16 | 9c50516 | 9c50916 |