81371052 has 36 divisors (see below), whose sum is σ = 235072656. Its totient is φ = 23248800.

The previous prime is 81371051. The next prime is 81371077. The reversal of 81371052 is 25017318.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×81371052³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81371051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161199 + ... + 161702.

It is an arithmetic number, because the mean of its divisors is an integer number (6529796).

Almost surely, 2^81371052 is an apocalyptic number.

It is an amenable number.

81371052 is an abundant number, since it is smaller than the sum of its proper divisors (153701604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81371052 is a wasteful number, since it uses less digits than its factorization.

81371052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322918 (or 322913 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 81371052 is about 9020.5904463067. The cubic root of 81371052 is about 433.3345433234.

The spelling of 81371052 in words is "eighty-one million, three hundred seventy-one thousand, fifty-two".