81179812 has 12 divisors (see below), whose sum is σ = 162359680. Its totient is φ = 34791336.

The previous prime is 81179809. The next prime is 81179827. The reversal of 81179812 is 21897118.

81179812 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1449612 + ... + 1449667.

Almost surely, 2^81179812 is an apocalyptic number.

It is an amenable number.

81179812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81179812 is a wasteful number, since it uses less digits than its factorization.

81179812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2899290 (or 2899288 counting only the distinct ones).

The product of its digits is 8064, while the sum is 37.

The square root of 81179812 is about 9009.9840177439. The cubic root of 81179812 is about 432.9947996325.

The spelling of 81179812 in words is "eighty-one million, one hundred seventy-nine thousand, eight hundred twelve".