Compare 1979 vs 1981
| Property | 1979 | 1981 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 19791 | 71 × 2831 |
| Prime factorization | 1979 | 7 × 283 |
| Divisors count | 2 | 4 |
| Divisors | 1, 1979 | 1, 7, 283, 1981 |
| Number of properties | 6 | 1 |
| Chen primes | 184th | |
| Emirps | 96th | |
| Isolated primes | 180th | |
| Long primes | 116th | |
| Primes | 299th | |
| Semiprimes | 572nd | |
| Sexy primes (2nd member) | 126th | |
| Roman numberals | MCMLXXIX | MCMLXXXI |
| Base 2 | 111101110112 | 111101111012 |
| Base 3 | 22010223 | 22011013 |
| Base 4 | 1323234 | 1323314 |
| Base 5 | 304045 | 304115 |
| Base 6 | 130556 | 131016 |
| Base 7 | 55257 | 55307 |
| Base 8 | 36738 | 36758 |
| Base 9 | 26389 | 26419 |
| Base 10 | 197910 | 198110 |
| Base 11 | 153a11 | 154111 |
| Base 12 | 118b12 | 119112 |
| Base 13 | b9313 | b9513 |
| Base 14 | a1514 | a1714 |
| Base 15 | 8be15 | 8c115 |
| Base 16 | 7bb16 | 7bd16 |