Compare 1979 vs 1991
| Property | 1979 | 1991 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 19791 | 111 × 1811 |
| Prime factorization | 1979 | 11 × 181 |
| Divisors count | 2 | 4 |
| Divisors | 1, 1979 | 1, 11, 181, 1991 |
| Number of properties | 6 | 1 |
| Chen primes | 184th | |
| Emirps | 96th | |
| Isolated primes | 180th | |
| Long primes | 116th | |
| Primes | 299th | |
| Semiprimes | 576th | |
| Sexy primes (2nd member) | 126th | |
| Roman numberals | MCMLXXIX | MCMXCI |
| Base 2 | 111101110112 | 111110001112 |
| Base 3 | 22010223 | 22012023 |
| Base 4 | 1323234 | 1330134 |
| Base 5 | 304045 | 304315 |
| Base 6 | 130556 | 131156 |
| Base 7 | 55257 | 55437 |
| Base 8 | 36738 | 37078 |
| Base 9 | 26389 | 26529 |
| Base 10 | 197910 | 199110 |
| Base 11 | 153a11 | 155011 |
| Base 12 | 118b12 | 119b12 |
| Base 13 | b9313 | ba213 |
| Base 14 | a1514 | a2314 |
| Base 15 | 8be15 | 8cb15 |
| Base 16 | 7bb16 | 7c716 |