Compare 640991 vs 640993
| Property | 640991 | 640993 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 131 × 493071 | 6409931 |
| Prime factorization | 13 × 49307 | 640993 |
| Divisors count | 4 | 2 |
| Divisors | 1, 13, 49307, 640991 | 1, 640993 |
| Number of properties | 1 | 3 |
| Additive primes | 20381st | |
| Isolated primes | 40876th | |
| Primes | 52151st | |
| Semiprimes | 137347th | |
| Roman numberals | ||
| Base 2 | 100111000111110111112 | 100111000111111000012 |
| Base 3 | 10121200211023 | 10121200211113 |
| Base 4 | 21301331334 | 21301332014 |
| Base 5 | 1310024315 | 1310024335 |
| Base 6 | 214233156 | 214233216 |
| Base 7 | 53065317 | 53065337 |
| Base 8 | 23437378 | 23437418 |
| Base 9 | 11762429 | 11762449 |
| Base 10 | 64099110 | 64099310 |
| Base 11 | 3a864a11 | 3a865111 |
| Base 12 | 26ab3b12 | 26ab4112 |
| Base 13 | 1959b013 | 1959b213 |
| Base 14 | 12985114 | 12985314 |
| Base 15 | c9dcb15 | c9dcd15 |
| Base 16 | 9c7df16 | 9c7e116 |