Compare 661221 vs 661231
| Property | 661221 | 661231 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 32 × 111 × 66791 | 6612311 |
| Prime factorization | 3 × 3 × 11 × 6679 | 661231 |
| Divisors count | 12 | 2 |
| Divisors | 1, 3, 9, 11, 33, 99, 6679, 20037, 60111, 73469, 220407, 661221 | 1, 661231 |
| Number of properties | 0 | 5 |
| Additive primes | 20951st | |
| Chen primes | 20995th | |
| Isolated primes | 42084th | |
| Primes | 53667th | |
| Sexy primes (1st member) | 11588th | |
| Roman numberals | ||
| Base 2 | 101000010110111001012 | 101000010110111011112 |
| Base 3 | 10201210002003 | 10201210010013 |
| Base 4 | 22011232114 | 22011232334 |
| Base 5 | 1321243415 | 1321244115 |
| Base 6 | 221011136 | 221011316 |
| Base 7 | 54225217 | 54225347 |
| Base 8 | 24133458 | 24133578 |
| Base 9 | 12170209 | 12170319 |
| Base 10 | 66122110 | 66123110 |
| Base 11 | 41187011 | 41187a11 |
| Base 12 | 27a79912 | 27a7a712 |
| Base 13 | 1a1c7213 | 1a1c7c13 |
| Base 14 | 132d8114 | 132d8b14 |
| Base 15 | d0db615 | d0dc115 |
| Base 16 | a16e516 | a16ef16 |