Compare 1973 vs 1981
| Property | 1973 | 1981 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 19731 | 71 × 2831 |
| Prime factorization | 1973 | 7 × 283 |
| Divisors count | 2 | 4 |
| Divisors | 1, 1973 | 1, 7, 283, 1981 |
| Number of properties | 7 | 1 |
| Good primes | 61st | |
| Harmonic primes | 111th | |
| Isolated primes | 179th | |
| Primes | 298th | |
| Pythagorean primes | 145th | |
| Semiprimes | 572nd | |
| Sexy primes (1st member) | 126th | |
| Sophie germain primes | 60th | |
| Roman numberals | MCMLXXIII | MCMLXXXI |
| Base 2 | 111101101012 | 111101111012 |
| Base 3 | 22010023 | 22011013 |
| Base 4 | 1323114 | 1323314 |
| Base 5 | 303435 | 304115 |
| Base 6 | 130456 | 131016 |
| Base 7 | 55167 | 55307 |
| Base 8 | 36658 | 36758 |
| Base 9 | 26329 | 26419 |
| Base 10 | 197310 | 198110 |
| Base 11 | 153411 | 154111 |
| Base 12 | 118512 | 119112 |
| Base 13 | b8a13 | b9513 |
| Base 14 | a0d14 | a1714 |
| Base 15 | 8b815 | 8c115 |
| Base 16 | 7b516 | 7bd16 |