Compare 661985 vs 661987
| Property | 661985 | 661987 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 51 × 431 × 30791 | 6619871 |
| Prime factorization | 5 × 43 × 3079 | 661987 |
| Divisors count | 8 | 2 |
| Divisors | 1, 5, 43, 215, 3079, 15395, 132397, 661985 | 1, 661987 |
| Number of properties | 0 | 5 |
| Additive primes | 20970th | |
| Chen primes | 21009th | |
| Isolated primes | 42127th | |
| Primes | 53716th | |
| Sexy primes (1st member) | 11599th | |
| Roman numberals | ||
| Base 2 | 101000011001111000012 | 101000011001111000112 |
| Base 3 | 10201220012223 | 10201220020013 |
| Base 4 | 22012132014 | 22012132034 |
| Base 5 | 1321404205 | 1321404225 |
| Base 6 | 221044256 | 221044316 |
| Base 7 | 54246627 | 54246647 |
| Base 8 | 24147418 | 24147438 |
| Base 9 | 12180589 | 12180619 |
| Base 10 | 66198510 | 66198710 |
| Base 11 | 4123a511 | 4123a711 |
| Base 12 | 27b11512 | 27b11712 |
| Base 13 | 1a240c13 | 1a241113 |
| Base 14 | 13336914 | 13336b14 |
| Base 15 | d122515 | d122715 |
| Base 16 | a19e116 | a19e316 |