Compare 991 vs 2447
| Property | 991 | 2447 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 9911 | 24471 |
| Prime factorization | 991 | 2447 |
| Divisors count | 2 | 2 |
| Divisors | 1, 991 | 1, 2447 |
| Number of properties | 10 | 9 |
| Additive primes | 89th | 191st |
| Chen primes | 115th | 219th |
| Emirps | 36th | |
| Harmonic primes | 135th | |
| Isolated primes | 98th | 220th |
| Long primes | 143rd | |
| Lucky primes | 42nd | |
| Primes | 167th | 363rd |
| Safe primes | 43rd | |
| Sexy primes (1st member) | 74th | |
| Sexy primes (2nd member) | 150th | |
| Solinas primes | 43rd | |
| Super primes | 39th | |
| Ulam primes | 18th | 28th |
| Roman numberals | CMXCI | MMCDXLVII |
| Base 2 | 11110111112 | 1001100011112 |
| Base 3 | 11002013 | 101001223 |
| Base 4 | 331334 | 2120334 |
| Base 5 | 124315 | 342425 |
| Base 6 | 43316 | 151556 |
| Base 7 | 26147 | 100647 |
| Base 8 | 17378 | 46178 |
| Base 9 | 13219 | 33189 |
| Base 10 | 99110 | 244710 |
| Base 11 | 82111 | 192511 |
| Base 12 | 6a712 | 14bb12 |
| Base 13 | 5b313 | 116313 |
| Base 14 | 50b14 | c6b14 |
| Base 15 | 46115 | ad215 |
| Base 16 | 3df16 | 98f16 |