79939791 has 20 divisors (see below), whose sum is σ = 122333904. Its totient is φ = 51991200.

The previous prime is 79939787. The next prime is 79939813. The reversal of 79939791 is 19793997.

It is not a de Polignac number, because 79939791 - 2² = 79939787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79939771) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8715 + ... + 15356.

Almost surely, 2^79939791 is an apocalyptic number.

79939791 is a deficient number, since it is larger than the sum of its proper divisors (42394113).

79939791 is a wasteful number, since it uses less digits than its factorization.

79939791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24124 (or 24115 counting only the distinct ones).

The product of its digits is 964467, while the sum is 54.

The square root of 79939791 is about 8940.9054910563. The cubic root of 79939791 is about 430.7788139114.

The spelling of 79939791 in words is "seventy-nine million, nine hundred thirty-nine thousand, seven hundred ninety-one".