Compare 1975 vs 1981
| Property | 1975 | 1981 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 3 | 2 |
| Prime factorization | 52 × 791 | 71 × 2831 |
| Prime factorization | 5 × 5 × 79 | 7 × 283 |
| Divisors count | 6 | 4 |
| Divisors | 1, 5, 25, 79, 395, 1975 | 1, 7, 283, 1981 |
| Number of properties | 0 | 1 |
| Semiprimes | 572nd | |
| Roman numberals | MCMLXXV | MCMLXXXI |
| Base 2 | 111101101112 | 111101111012 |
| Base 3 | 22010113 | 22011013 |
| Base 4 | 1323134 | 1323314 |
| Base 5 | 304005 | 304115 |
| Base 6 | 130516 | 131016 |
| Base 7 | 55217 | 55307 |
| Base 8 | 36678 | 36758 |
| Base 9 | 26349 | 26419 |
| Base 10 | 197510 | 198110 |
| Base 11 | 153611 | 154111 |
| Base 12 | 118712 | 119112 |
| Base 13 | b8c13 | b9513 |
| Base 14 | a1114 | a1714 |
| Base 15 | 8ba15 | 8c115 |
| Base 16 | 7b716 | 7bd16 |