Compare 1287 vs 1291
| Property | 1287 | 1291 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 32 × 111 × 131 | 12911 |
| Prime factorization | 3 × 3 × 11 × 13 | 1291 |
| Divisors count | 12 | 2 |
| Divisors | 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429, 1287 | 1, 1291 |
| Number of properties | 0 | 9 |
| Additive primes | 113th | |
| Chen primes | 137th | |
| Harmonic primes | 73rd | |
| Long primes | 80th | |
| Lucky primes | 54th | |
| Primes | 210th | |
| Sexy primes (1st member) | 91st | |
| Sexy prime triplets (1st member) | 35th | |
| Twin primes (2nd member) | 44th | |
| Roman numberals | MCCLXXXVII | MCCXCI |
| Base 2 | 101000001112 | 101000010112 |
| Base 3 | 12022003 | 12022113 |
| Base 4 | 1100134 | 1100234 |
| Base 5 | 201225 | 201315 |
| Base 6 | 55436 | 55516 |
| Base 7 | 35167 | 35237 |
| Base 8 | 24078 | 24138 |
| Base 9 | 16809 | 16849 |
| Base 10 | 128710 | 129110 |
| Base 11 | a7011 | a7411 |
| Base 12 | 8b312 | 8b712 |
| Base 13 | 78013 | 78413 |
| Base 14 | 67d14 | 68314 |
| Base 15 | 5ac15 | 5b115 |
| Base 16 | 50716 | 50b16 |