Compare 991 vs 2017
| Property | 991 | 2017 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 20171 |
| Prime factorization | 991 | 2017 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 2017 |
| Number of properties | 10 | 7 |
| Additive primes | 89th | |
| Chen primes | 115th | 187th |
| Emirps | 36th | |
| Isolated primes | 98th | 185th |
| Long primes | 117th | |
| Lucky primes | 42nd | |
| Primes | 167th | 306th |
| Pythagorean primes | 148th | |
| Sexy primes (1st member) | 74th | |
| Sexy primes (2nd member) | 130th | |
| Solinas primes | 43rd | 54th |
| Super primes | 39th | |
| Ulam primes | 18th | |
| Roman numberals | CMXCI | MMXVII |
| Base 2 | 11110111112 | 111111000012 |
| Base 3 | 11002013 | 22022013 |
| Base 4 | 331334 | 1332014 |
| Base 5 | 124315 | 310325 |
| Base 6 | 43316 | 132016 |
| Base 7 | 26147 | 56117 |
| Base 8 | 17378 | 37418 |
| Base 9 | 13219 | 26819 |
| Base 10 | 99110 | 201710 |
| Base 11 | 82111 | 157411 |
| Base 12 | 6a712 | 120112 |
| Base 13 | 5b313 | bc213 |
| Base 14 | 50b14 | a4114 |
| Base 15 | 46115 | 8e715 |
| Base 16 | 3df16 | 7e116 |