Compare 13 vs 23

Unique factors11
Total factors11
Prime factorization131231
Prime factorization1323
Divisors count22
Divisors1, 131, 23
Number of properties3230
Additive primes 6th
Centered square primes2nd 
Chen primes6th9th
Class 1+ primes 7th
Cousin primes (2nd member) 4th
Cousin primes (1st member)3rd 
Cuban primes 21st 
Factorial primes 5th
Fibonacci primes4th 
Happy primes2nd4th
Harmonic primes2nd4th
Isolated primes 2nd
Kynea primes 3rd
Left-truncatable primes5th7th
Long primes 4th
Lucky primes3rd 
Multiplicative primes5th 
Pierpont primes5th 
Pierpont primes of the 2nd kind 7th
Prime quadruplets (2nd member)2nd 
Prime quadruplets (4th member)1st 
Prime quintuplet 1s (3rd member)1st 
Prime quintuplet 2s (2nd member)2nd 
Prime quintuplet 2s (5th member) 2nd
Prime quintuplet 2s (4th member)1st 
Prime sextuplets (6th member) 1st
Prime sextuplets (3rd member)1st 
Prime triplets (1st member)4th 
Prime triplets (2nd member)3rd 
Prime triplets (3rd member)2nd5th
Proth primes3rd 
Pythagorean primes2nd 
Right-truncatable primes 5th
Safe primes 4th
Sexy primes (1st member)4th6th
Sexy primes (2nd member)2nd5th
Sexy prime quadrupletss (4th member) 1st
Sexy prime quadrupletss (3rd member) 2nd
Sexy prime triplets (2nd member)2nd4th
Sexy prime triplets (3rd member) 3rd
Solinas primes5th8th
Sophie germain primes 5th
Thabit primes 4th
Thabit primes of the 2nd kind2nd 
Twin primes (2nd member)3rd 
Two-sided primes 5th
Ulam primes4th 
Wedderburn-etherington primes 4th
Wilson primes2nd 
Woodall primes 2nd
Roman numberalsXIIIXXIII
Base 211012101112
Base 311132123
Base 43141134
Base 5235435
Base 6216356
Base 7167327
Base 8158278
Base 9149259
Base 1013102310
Base 1112112111
Base 1211121b12
Base 1310131a13
Base 14d141914
Base 15d151815
Base 16d161716
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