1. Numbers
  2. Compare 71 vs 81

Compare 71 vs 81

Property7181
Typeprimecomposite number
Unique factors11
Total factors14
Prime factorization71134
Prime factorization713 × 3 × 3 × 3
Divisors count25
Divisors1, 711, 3, 9, 27, 81
Number of properties130
Centered heptagonal primes2nd 
Chen primes18th 
Class 1+ primes11th 
Cousin primes (2nd member)7th 
Emirps5th 
Good primes10th 
Multiplicative primes8th 
Pierpont primes of the 2nd kind11th 
Primes20th 
Prime triplets (2nd member)8th 
Right-truncatable primes11th 
Solinas primes17th 
Twin primes (1st member)8th 
Roman numberalsLXXILXXXI
Base 21000111210100012
Base 321223100003
Base 41013411014
Base 524153115
Base 615562136
Base 713171447
Base 810781218
Base 97891009
Base 1071108110
Base 1165117411
Base 125b126912
Base 1356136313
Base 1451145b14
Base 154b155615
Base 1647165116
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