81130012 has 12 divisors (see below), whose sum is σ = 142111816. Its totient is φ = 40526640.

The previous prime is 81129959. The next prime is 81130043. The reversal of 81130012 is 21003118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4539 + ... + 13522.

Almost surely, 2^81130012 is an apocalyptic number.

It is an amenable number.

81130012 is a deficient number, since it is larger than the sum of its proper divisors (60981804).

81130012 is a wasteful number, since it uses less digits than its factorization.

81130012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19188 (or 19186 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 81130012 is about 9007.2199928724. The cubic root of 81130012 is about 432.9062408668.

The spelling of 81130012 in words is "eighty-one million, one hundred thirty thousand, twelve".