Compare 13 vs 71

Unique factors11
Total factors11
Prime factorization131711
Prime factorization1371
Divisors count22
Divisors1, 131, 71
Number of properties3213
Centered heptagonal primes 2nd
Centered square primes2nd 
Chen primes6th18th
Class 1+ primes 11th
Cousin primes (2nd member) 7th
Cousin primes (1st member)3rd 
Cuban primes 21st 
Fibonacci primes4th 
Good primes 10th
Happy primes2nd 
Harmonic primes2nd 
Left-truncatable primes5th 
Lucky primes3rd 
Multiplicative primes5th8th
Pierpont primes5th 
Pierpont primes of the 2nd kind 11th
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)3rd8th
Prime triplets (3rd member)2nd 
Proth primes3rd 
Pythagorean primes2nd 
Right-truncatable primes 11th
Sexy primes (1st member)4th 
Sexy primes (2nd member)2nd 
Sexy prime triplets (2nd member)2nd 
Solinas primes5th17th
Thabit primes of the 2nd kind2nd 
Twin primes (1st member) 8th
Twin primes (2nd member)3rd 
Ulam primes4th 
Wilson primes2nd 
Roman numberalsXIIILXXI
Base 21101210001112
Base 3111321223
Base 431410134
Base 52352415
Base 62161556
Base 71671317
Base 81581078
Base 9149789
Base 1013107110
Base 1112116511
Base 1211125b12
Base 1310135613
Base 14d145114
Base 15d154b15
Base 16d164716
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