81130152 has 32 divisors (see below), whose sum is σ = 213501600. Its totient is φ = 25619904.

The previous prime is 81130129. The next prime is 81130163. The reversal of 81130152 is 25103118.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88503 + ... + 89414.

It is an arithmetic number, because the mean of its divisors is an integer number (6671925).

Almost surely, 2^81130152 is an apocalyptic number.

It is an amenable number.

81130152 is an abundant number, since it is smaller than the sum of its proper divisors (132371448).

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

81130152 is a wasteful number, since it uses less digits than its factorization.

81130152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177945 (or 177941 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 81130152 is about 9007.2277644123. The cubic root of 81130152 is about 432.9064898779.

The spelling of 81130152 in words is "eighty-one million, one hundred thirty thousand, one hundred fifty-two".