Compare 665981 vs 665989
| Property | 665981 | 665989 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 6659811 | 2931 × 22731 |
| Prime factorization | 665981 | 293 × 2273 |
| Divisors count | 2 | 4 |
| Divisors | 1, 665981 | 1, 293, 2273, 665989 |
| Number of properties | 4 | 1 |
| Chen primes | 21124th | |
| Primes | 54020th | |
| Semiprimes | 142454th | |
| Twin primes (1st member) | 5831st | |
| Ulam primes | 3967th | |
| Roman numberals | ||
| Base 2 | 101000101001011111012 | 101000101001100001012 |
| Base 3 | 10202111122223 | 10202111200213 |
| Base 4 | 22022113314 | 22022120114 |
| Base 5 | 1323024115 | 1323024245 |
| Base 6 | 221351256 | 221351416 |
| Base 7 | 54424317 | 54424427 |
| Base 8 | 24245758 | 24246058 |
| Base 9 | 12244889 | 12245079 |
| Base 10 | 66598110 | 66598910 |
| Base 11 | 4153a811 | 41540511 |
| Base 12 | 2814a512 | 2814b112 |
| Base 13 | 1a419413 | 1a419c13 |
| Base 14 | 1349c114 | 1349c914 |
| Base 15 | d24db15 | d24e415 |
| Base 16 | a297d16 | a298516 |