Compare 31 vs 211
| Property | 31 | 211 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 311 | 2111 |
| Prime factorization | 31 | 211 |
| Divisors count | 2 | 2 |
| Divisors | 1, 31 | 1, 211 |
| Number of properties | 18 | 8 |
| Centered decagonal primes | 2nd | 6th |
| Centered triangular primes | 2nd | |
| Chen primes | 11th | 37th |
| Class 1+ primes | 8th | |
| Emirps | 3rd | |
| Euclid primes | 4th | 5th |
| Happy primes | 5th | |
| Isolated primes | 18th | |
| Lucky primes | 4th | 14th |
| Mersenne primes | 3rd | |
| Multiplicative primes | 7th | 12th |
| Pierpont primes of the 2nd kind | 8th | |
| Primes | 11th | 47th |
| Right-truncatable primes | 7th | |
| Sexy primes (1st member) | 7th | |
| Sexy prime triplets (1st member) | 5th | |
| Solinas primes | 10th | |
| Super primes | 5th | 15th |
| Twin primes (2nd member) | 5th | |
| Roman numberals | XXXI | CCXI |
| Base 2 | 111112 | 110100112 |
| Base 3 | 10113 | 212113 |
| Base 4 | 1334 | 31034 |
| Base 5 | 1115 | 13215 |
| Base 6 | 516 | 5516 |
| Base 7 | 437 | 4217 |
| Base 8 | 378 | 3238 |
| Base 9 | 349 | 2549 |
| Base 10 | 3110 | 21110 |
| Base 11 | 2911 | 18211 |
| Base 12 | 2712 | 15712 |
| Base 13 | 2513 | 13313 |
| Base 14 | 2314 | 11114 |
| Base 15 | 2115 | e115 |
| Base 16 | 1f16 | d316 |