Compare 640859 vs 640861
| Property | 640859 | 640861 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 6408591 | 131 × 492971 |
| Prime factorization | 640859 | 13 × 49297 |
| Divisors count | 2 | 4 |
| Divisors | 1, 640859 | 1, 13, 49297, 640861 |
| Number of properties | 5 | 1 |
| Chen primes | 20402nd | |
| Isolated primes | 40863rd | |
| Primes | 52138th | |
| Semiprimes | 137322nd | |
| Sexy primes (2nd member) | 11297th | |
| Sexy prime triplets (3rd member) | 2072nd | |
| Roman numberals | ||
| Base 2 | 100111000111010110112 | 100111000111010111012 |
| Base 3 | 10121200021123 | 10121200021213 |
| Base 4 | 21301311234 | 21301311314 |
| Base 5 | 1310014145 | 1310014215 |
| Base 6 | 214225356 | 214225416 |
| Base 7 | 53062527 | 53062547 |
| Base 8 | 23435338 | 23435358 |
| Base 9 | 11760759 | 11760779 |
| Base 10 | 64085910 | 64086110 |
| Base 11 | 3a853a11 | 3a854111 |
| Base 12 | 26aa4b12 | 26aa5112 |
| Base 13 | 19590b13 | 19591013 |
| Base 14 | 12979914 | 12979b14 |
| Base 15 | c9d3e15 | c9d4115 |
| Base 16 | 9c75b16 | 9c75d16 |