Compare 640691 vs 640693
| Property | 640691 | 640693 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 6406911 | 1511 × 42431 |
| Prime factorization | 640691 | 151 × 4243 |
| Divisors count | 2 | 4 |
| Divisors | 1, 640691 | 1, 151, 4243, 640693 |
| Number of properties | 5 | 1 |
| Chen primes | 20397th | |
| Cousin primes (2nd member) | 5637th | |
| Isolated primes | 40853rd | |
| Primes | 52128th | |
| Semiprimes | 137288th | |
| Sophie germain primes | 5311th | |
| Roman numberals | ||
| Base 2 | 100111000110101100112 | 100111000110101101012 |
| Base 3 | 10121122120223 | 10121122121013 |
| Base 4 | 21301223034 | 21301223114 |
| Base 5 | 1310002315 | 1310002335 |
| Base 6 | 214220556 | 214221016 |
| Base 7 | 53056227 | 53056247 |
| Base 8 | 23432638 | 23432658 |
| Base 9 | 11757689 | 11757719 |
| Base 10 | 64069110 | 64069310 |
| Base 11 | 3a83a711 | 3a83a911 |
| Base 12 | 26a92b12 | 26a93112 |
| Base 13 | 19580c13 | 19581113 |
| Base 14 | 1296b914 | 1296bb14 |
| Base 15 | c9c7b15 | c9c7d15 |
| Base 16 | 9c6b316 | 9c6b516 |