81044280113 has 32 divisors (see below), whose sum is σ = 88682880000. Its totient is φ = 73797241536.

The previous prime is 81044280103. The next prime is 81044280139. The reversal of 81044280113 is 31108244018.

It is a happy number.

It is not a de Polignac number, because 81044280113 - 2⁸ = 81044279857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81044280113.

It is not an unprimeable number, because it can be changed into a prime (81044280103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36130970 + ... + 36133212.

It is an arithmetic number, because the mean of its divisors is an integer number (2771340000).

Almost surely, 2^81044280113 is an apocalyptic number.

It is an amenable number.

81044280113 is a deficient number, since it is larger than the sum of its proper divisors (7638599887).

81044280113 is a wasteful number, since it uses less digits than its factorization.

81044280113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901.

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 81044280113 in words is "eighty-one billion, forty-four million, two hundred eighty thousand, one hundred thirteen".