Compare 28 vs 31

Typecomposite numberprime
Unique factors21
Total factors31
Prime factorization22 × 71311
Prime factorization2 × 2 × 731
Divisors count62
Divisors1, 2, 4, 7, 14, 281, 31
Number of properties018
Centered decagonal primes 2nd
Centered triangular primes 2nd
Chen primes 11th
Class 1+ primes 8th
Emirps 3rd
Euclid primes 4th
Happy primes 5th
Lucky primes 4th
Mersenne primes 3rd
Multiplicative primes 7th
Pierpont primes of the 2nd kind 8th
Primes 11th
Right-truncatable primes 7th
Sexy primes (1st member) 7th
Sexy prime triplets (1st member) 5th
Solinas primes 10th
Super primes 5th
Twin primes (2nd member) 5th
Roman numberalsXXVIIIXXXI
Base 2111002111112
Base 31001310113
Base 413041334
Base 510351115
Base 6446516
Base 7407437
Base 8348378
Base 9319349
Base 1028103110
Base 1126112911
Base 1224122712
Base 1322132513
Base 1420142314
Base 151d152115
Base 161c161f16
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