Compare 988 vs 991
| Property | 988 | 991 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 22 × 131 × 191 | 9911 |
| Prime factorization | 2 × 2 × 13 × 19 | 991 |
| Divisors count | 12 | 2 |
| Divisors | 1, 2, 4, 13, 19, 26, 38, 52, 76, 247, 494, 988 | 1, 991 |
| Number of properties | 0 | 10 |
| Additive primes | 89th | |
| Chen primes | 115th | |
| Emirps | 36th | |
| Isolated primes | 98th | |
| Lucky primes | 42nd | |
| Primes | 167th | |
| Sexy primes (1st member) | 74th | |
| Solinas primes | 43rd | |
| Super primes | 39th | |
| Ulam primes | 18th | |
| Roman numberals | CMLXXXVIII | CMXCI |
| Base 2 | 11110111002 | 11110111112 |
| Base 3 | 11001213 | 11002013 |
| Base 4 | 331304 | 331334 |
| Base 5 | 124235 | 124315 |
| Base 6 | 43246 | 43316 |
| Base 7 | 26117 | 26147 |
| Base 8 | 17348 | 17378 |
| Base 9 | 13179 | 13219 |
| Base 10 | 98810 | 99110 |
| Base 11 | 81911 | 82111 |
| Base 12 | 6a412 | 6a712 |
| Base 13 | 5b013 | 5b313 |
| Base 14 | 50814 | 50b14 |
| Base 15 | 45d15 | 46115 |
| Base 16 | 3dc16 | 3df16 |