Compare 18 vs 53

Typecomposite numberprime
Unique factors21
Total factors31
Prime factorization21 × 32531
Prime factorization2 × 3 × 353
Divisors count62
Divisors1, 2, 3, 6, 9, 181, 53
Number of properties018
Chen primes 15th
Class 1+ primes 10th
Good primes 7th
Isolated primes 5th
Left-truncatable primes 11th
Pierpont primes of the 2nd kind 10th
Primes 16th
Pythagorean primes 7th
Restricted right-truncatable primes 1st
Right-truncatable primes 9th
Sexy primes (1st member) 11th
Sexy primes (2nd member) 10th
Sexy prime quadrupletss (3rd member) 3rd
Sexy prime triplets (2nd member) 7th
Sexy prime triplets (3rd member) 6th
Sophie germain primes 8th
Two-sided primes 7th
Ulam primes 6th
Roman numberalsXVIIILIII
Base 21001021101012
Base 3200312223
Base 410243114
Base 53352035
Base 63061256
Base 72471047
Base 8228658
Base 9209589
Base 1018105310
Base 1117114911
Base 1216124512
Base 1315134113
Base 1414143b14
Base 1513153815
Base 1612163516
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