Compare 13 vs 56

Typeprimecomposite number
Unique factors12
Total factors14
Prime factorization13123 × 71
Prime factorization132 × 2 × 2 × 7
Divisors count28
Divisors1, 131, 2, 4, 7, 8, 14, 28, 56
Number of properties320
Centered square primes2nd 
Chen primes6th 
Cousin primes (1st member)3rd 
Cuban primes 21st 
Fibonacci primes4th 
Happy primes2nd 
Harmonic primes2nd 
Left-truncatable primes5th 
Lucky primes3rd 
Multiplicative primes5th 
Pierpont primes5th 
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 (4th member)1st 
Prime sextuplets (3rd member)1st 
Prime triplets (1st member)4th 
Prime triplets (2nd member)3rd 
Prime triplets (3rd member)2nd 
Proth primes3rd 
Pythagorean primes2nd 
Sexy primes (1st member)4th 
Sexy primes (2nd member)2nd 
Sexy prime triplets (2nd member)2nd 
Solinas primes5th 
Thabit primes of the 2nd kind2nd 
Twin primes (2nd member)3rd 
Ulam primes4th 
Wilson primes2nd 
Roman numberalsXIIILVI
Base 2110121110002
Base 3111320023
Base 43143204
Base 52352115
Base 62161326
Base 71671107
Base 8158708
Base 9149629
Base 1013105610
Base 1112115111
Base 1211124812
Base 1310134413
Base 14d144014
Base 15d153b15
Base 16d163816
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