81300000812 has 12 divisors (see below), whose sum is σ = 148460871216. Its totient is φ = 38882609040.

The previous prime is 81300000811. The next prime is 81300000823. The reversal of 81300000812 is 21800000318.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (81300000811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441847739 + ... + 441847922.

It is an arithmetic number, because the mean of its divisors is an integer number (12371739268).

Almost surely, 2^81300000812 is an apocalyptic number.

It is an amenable number.

81300000812 is a deficient number, since it is larger than the sum of its proper divisors (67160870404).

81300000812 is a wasteful number, since it uses less digits than its factorization.

81300000812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883695688 (or 883695686 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The spelling of 81300000812 in words is "eighty-one billion, three hundred million, eight hundred twelve", and thus it is an aban number.