Compare 13 vs 181

Unique factors11
Total factors11
Prime factorization1311811
Prime factorization13181
Divisors count22
Divisors1, 131, 181
Number of properties328
Centered square primes2nd6th
Chen primes6th33rd
Cousin primes (1st member)3rd 
Cuban primes 21st 
Dihedral primes 5th
Fibonacci primes4th 
Happy primes2nd 
Harmonic primes2nd 
Left-truncatable primes5th 
Long primes 16th
Lucky primes3rd 
Multiplicative primes5th 
Palindromic primes 9th
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 primes2nd19th
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)3rd13th
Ulam primes4th 
Wilson primes2nd 
Roman numberalsXIIICLXXXI
Base 211012101101012
Base 31113202013
Base 431423114
Base 523512115
Base 62165016
Base 71673467
Base 81582658
Base 91492219
Base 10131018110
Base 11121115511
Base 12111213112
Base 13101310c13
Base 14d14cd14
Base 15d15c115
Base 16d16b516
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