Compare 640689 vs 640691
| Property | 640689 | 640691 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 31 × 71 × 305091 | 6406911 |
| Prime factorization | 3 × 7 × 30509 | 640691 |
| Divisors count | 8 | 2 |
| Divisors | 1, 3, 7, 21, 30509, 91527, 213563, 640689 | 1, 640691 |
| Number of properties | 0 | 5 |
| Chen primes | 20397th | |
| Cousin primes (2nd member) | 5637th | |
| Isolated primes | 40853rd | |
| Primes | 52128th | |
| Sophie germain primes | 5311th | |
| Roman numberals | ||
| Base 2 | 100111000110101100012 | 100111000110101100112 |
| Base 3 | 10121122120203 | 10121122120223 |
| Base 4 | 21301223014 | 21301223034 |
| Base 5 | 1310002245 | 1310002315 |
| Base 6 | 214220536 | 214220556 |
| Base 7 | 53056207 | 53056227 |
| Base 8 | 23432618 | 23432638 |
| Base 9 | 11757669 | 11757689 |
| Base 10 | 64068910 | 64069110 |
| Base 11 | 3a83a511 | 3a83a711 |
| Base 12 | 26a92912 | 26a92b12 |
| Base 13 | 19580a13 | 19580c13 |
| Base 14 | 1296b714 | 1296b914 |
| Base 15 | c9c7915 | c9c7b15 |
| Base 16 | 9c6b116 | 9c6b316 |