81079313396 has 18 divisors (see below), whose sum is σ = 149749676370. Its totient is φ = 38405989872.

The previous prime is 81079313383. The next prime is 81079313401. The reversal of 81079313396 is 69331397018.

It can be written as a sum of positive squares in only one way, i.e., 51551702500 + 29527610896 = 227050^2 + 171836^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28073111 + ... + 28075998.

It is an arithmetic number, because the mean of its divisors is an integer number (8319426465).

Almost surely, 2^81079313396 is an apocalyptic number.

It is an amenable number.

81079313396 is a deficient number, since it is larger than the sum of its proper divisors (68670362974).

81079313396 is a wasteful number, since it uses less digits than its factorization.

81079313396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56149151 (or 56149130 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 81079313396 in words is "eighty-one billion, seventy-nine million, three hundred thirteen thousand, three hundred ninety-six".