Compare 1221 vs 1231
| Property | 1221 | 1231 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 31 × 111 × 371 | 12311 |
| Prime factorization | 3 × 11 × 37 | 1231 |
| Divisors count | 8 | 2 |
| Divisors | 1, 3, 11, 33, 37, 111, 407, 1221 | 1, 1231 |
| Number of properties | 0 | 6 |
| Additive primes | 108th | |
| Emirps | 56th | |
| Lucky primes | 52nd | |
| Primes | 202nd | |
| Sexy primes (1st member) | 88th | |
| Twin primes (2nd member) | 42nd | |
| Roman numberals | MCCXXI | MCCXXXI |
| Base 2 | 100110001012 | 100110011112 |
| Base 3 | 12000203 | 12001213 |
| Base 4 | 1030114 | 1030334 |
| Base 5 | 143415 | 144115 |
| Base 6 | 53536 | 54116 |
| Base 7 | 33637 | 34067 |
| Base 8 | 23058 | 23178 |
| Base 9 | 16069 | 16179 |
| Base 10 | 122110 | 123110 |
| Base 11 | a1011 | a1a11 |
| Base 12 | 85912 | 86712 |
| Base 13 | 72c13 | 73913 |
| Base 14 | 63314 | 63d14 |
| Base 15 | 56615 | 57115 |
| Base 16 | 4c516 | 4cf16 |