81136125 has 48 divisors (see below), whose sum is σ = 167172096. Its totient is φ = 37087200.

The previous prime is 81136103. The next prime is 81136169. The reversal of 81136125 is 52163118.

It is not a de Polignac number, because 81136125 - 2⁵ = 81136093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2724 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (3482752).

Almost surely, 2^81136125 is an apocalyptic number.

It is an amenable number.

81136125 is an abundant number, since it is smaller than the sum of its proper divisors (86035971).

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

81136125 is a wasteful number, since it uses less digits than its factorization.

81136125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10331 (or 10318 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 81136125 is about 9007.5593253667. The cubic root of 81136125 is about 432.9171134950.

The spelling of 81136125 in words is "eighty-one million, one hundred thirty-six thousand, one hundred twenty-five".