Compare 991 vs 1187
| Property | 991 | 1187 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 11871 |
| Prime factorization | 991 | 1187 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 1187 |
| Number of properties | 10 | 8 |
| Additive primes | 89th | 105th |
| Chen primes | 115th | 128th |
| Emirps | 36th | |
| Isolated primes | 98th | 114th |
| Lucky primes | 42nd | |
| Primes | 167th | 195th |
| Safe primes | 27th | |
| Sexy primes (1st member) | 74th | 85th |
| Sexy primes (2nd member) | 84th | |
| Sexy prime triplets (2nd member) | 32nd | |
| Solinas primes | 43rd | |
| Super primes | 39th | |
| Ulam primes | 18th | |
| Roman numberals | CMXCI | MCLXXXVII |
| Base 2 | 11110111112 | 100101000112 |
| Base 3 | 11002013 | 11212223 |
| Base 4 | 331334 | 1022034 |
| Base 5 | 124315 | 142225 |
| Base 6 | 43316 | 52556 |
| Base 7 | 26147 | 33147 |
| Base 8 | 17378 | 22438 |
| Base 9 | 13219 | 15589 |
| Base 10 | 99110 | 118710 |
| Base 11 | 82111 | 98a11 |
| Base 12 | 6a712 | 82b12 |
| Base 13 | 5b313 | 70413 |
| Base 14 | 50b14 | 60b14 |
| Base 15 | 46115 | 54215 |
| Base 16 | 3df16 | 4a316 |