79311564391 has 6 divisors (see below), whose sum is σ = 81871620576. Its totient is φ = 76751609400.

The previous prime is 79311564331. The next prime is 79311564419. The reversal of 79311564391 is 19346511397.

It is not a de Polignac number, because 79311564391 - 2³¹ = 77164080743 is a prime.

It is a super-2 number, since 2×79311564391² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79311564331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1542721 + ... + 1593301.

It is an arithmetic number, because the mean of its divisors is an integer number (13645270096).

Almost surely, 2^79311564391 is an apocalyptic number.

79311564391 is a deficient number, since it is larger than the sum of its proper divisors (2560056185).

79311564391 is an frugal number, since it uses more digits than its factorization.

79311564391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101193 (or 50612 counting only the distinct ones).

The product of its digits is 612360, while the sum is 49.

The spelling of 79311564391 in words is "seventy-nine billion, three hundred eleven million, five hundred sixty-four thousand, three hundred ninety-one".