Compare 1 vs 3
| Property | 1 | 3 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 0 | 1 |
| Total factors | 0 | 1 |
| Prime factorization | 31 | |
| Prime factorization | 3 | |
| Divisors count | 1 | 2 |
| Divisors | 1 | 1, 3 |
| Number of properties | 0 | 29 |
| Additive primes | 2nd | |
| Chen primes | 2nd | |
| Class 1+ primes | 2nd | |
| Cousin primes (1st member) | 1st | |
| Cullen primes | 1st | |
| Euclid primes | 2nd | |
| Factorial primes | 2nd | |
| Fermat primes | 1st | |
| Fibonacci primes | 2nd | |
| Left-truncatable primes | 2nd | |
| Leyland primes | 1st | |
| Lucas primes | 2nd | |
| Lucky primes | 1st | |
| Mersenne primes | 1st | |
| Multiplicative primes | 2nd | |
| Palindromic primes | 2nd | |
| Pierpont primes | 2nd | |
| Pierpont primes of the 2nd kind | 2nd | |
| Primes | 2nd | |
| Proth primes | 1st | |
| Right-truncatable primes | 2nd | |
| Solinas primes | 1st | |
| Sophie germain primes | 2nd | |
| Super primes | 1st | |
| Twin primes (1st member) | 1st | |
| Two-sided primes | 2nd | |
| Ulam primes | 2nd | |
| Wagstaff primes | 1st | |
| Wedderburn-etherington primes | 2nd | |
| Roman numberals | I | III |
| Base 2 | 12 | 112 |
| Base 3 | 13 | 103 |
| Base 4 | 14 | 34 |
| Base 5 | 15 | 35 |
| Base 6 | 16 | 36 |
| Base 7 | 17 | 37 |
| Base 8 | 18 | 38 |
| Base 9 | 19 | 39 |
| Base 10 | 110 | 310 |
| Base 11 | 111 | 311 |
| Base 12 | 112 | 312 |
| Base 13 | 113 | 313 |
| Base 14 | 114 | 314 |
| Base 15 | 115 | 315 |
| Base 16 | 116 | 316 |