Compare 991 vs 1217
| Property | 991 | 1217 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 12171 |
| Prime factorization | 991 | 1217 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 1217 |
| Number of properties | 10 | 12 |
| Additive primes | 89th | 107th |
| Chen primes | 115th | 131st |
| Cousin primes (2nd member) | 45th | |
| Emirps | 36th | 53rd |
| Isolated primes | 98th | 118th |
| Long primes | 76th | |
| Lucky primes | 42nd | |
| Primes | 167th | 199th |
| Proth primes | 19th | |
| Pythagorean primes | 98th | |
| Sexy primes (1st member) | 74th | 86th |
| Sexy prime triplets (1st member) | 33rd | |
| Solinas primes | 43rd | |
| Super primes | 39th | 46th |
| Ulam primes | 18th | |
| Roman numberals | CMXCI | MCCXVII |
| Base 2 | 11110111112 | 100110000012 |
| Base 3 | 11002013 | 12000023 |
| Base 4 | 331334 | 1030014 |
| Base 5 | 124315 | 143325 |
| Base 6 | 43316 | 53456 |
| Base 7 | 26147 | 33567 |
| Base 8 | 17378 | 23018 |
| Base 9 | 13219 | 16029 |
| Base 10 | 99110 | 121710 |
| Base 11 | 82111 | a0711 |
| Base 12 | 6a712 | 85512 |
| Base 13 | 5b313 | 72813 |
| Base 14 | 50b14 | 62d14 |
| Base 15 | 46115 | 56215 |
| Base 16 | 3df16 | 4c116 |