81130712 has 32 divisors (see below), whose sum is σ = 164287200. Its totient is φ = 37338624.

The previous prime is 81130711. The next prime is 81130727. The reversal of 81130712 is 21703118.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44768 + ... + 46544.

It is an arithmetic number, because the mean of its divisors is an integer number (5133975).

Almost surely, 2^81130712 is an apocalyptic number.

It is an amenable number.

81130712 is an abundant number, since it is smaller than the sum of its proper divisors (83156488).

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

81130712 is a wasteful number, since it uses less digits than its factorization.

81130712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235 (or 2231 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 81130712 is about 9007.2588505050. The cubic root of 81130712 is about 432.9074859198.

The spelling of 81130712 in words is "eighty-one million, one hundred thirty thousand, seven hundred twelve".