Compare 1961 vs 1973
| Property | 1961 | 1973 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 371 × 531 | 19731 |
| Prime factorization | 37 × 53 | 1973 |
| Divisors count | 4 | 2 |
| Divisors | 1, 37, 53, 1961 | 1, 1973 |
| Number of properties | 1 | 7 |
| Good primes | 61st | |
| Harmonic primes | 111th | |
| Isolated primes | 179th | |
| Primes | 298th | |
| Pythagorean primes | 145th | |
| Semiprimes | 566th | |
| Sexy primes (1st member) | 126th | |
| Sophie germain primes | 60th | |
| Roman numberals | MCMLXI | MCMLXXIII |
| Base 2 | 111101010012 | 111101101012 |
| Base 3 | 22001223 | 22010023 |
| Base 4 | 1322214 | 1323114 |
| Base 5 | 303215 | 303435 |
| Base 6 | 130256 | 130456 |
| Base 7 | 55017 | 55167 |
| Base 8 | 36518 | 36658 |
| Base 9 | 26189 | 26329 |
| Base 10 | 196110 | 197310 |
| Base 11 | 152311 | 153411 |
| Base 12 | 117512 | 118512 |
| Base 13 | b7b13 | b8a13 |
| Base 14 | a0114 | a0d14 |
| Base 15 | 8ab15 | 8b815 |
| Base 16 | 7a916 | 7b516 |