Compare 1977 vs 1981
| Property | 1977 | 1981 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 31 × 6591 | 71 × 2831 |
| Prime factorization | 3 × 659 | 7 × 283 |
| Divisors count | 4 | 4 |
| Divisors | 1, 3, 659, 1977 | 1, 7, 283, 1981 |
| Number of properties | 1 | 1 |
| Semiprimes | 571st | 572nd |
| Roman numberals | MCMLXXVII | MCMLXXXI |
| Base 2 | 111101110012 | 111101111012 |
| Base 3 | 22010203 | 22011013 |
| Base 4 | 1323214 | 1323314 |
| Base 5 | 304025 | 304115 |
| Base 6 | 130536 | 131016 |
| Base 7 | 55237 | 55307 |
| Base 8 | 36718 | 36758 |
| Base 9 | 26369 | 26419 |
| Base 10 | 197710 | 198110 |
| Base 11 | 153811 | 154111 |
| Base 12 | 118912 | 119112 |
| Base 13 | b9113 | b9513 |
| Base 14 | a1314 | a1714 |
| Base 15 | 8bc15 | 8c115 |
| Base 16 | 7b916 | 7bd16 |