79521897 has 32 divisors (see below), whose sum is σ = 137374720. Its totient is φ = 39735360.

The previous prime is 79521881. The next prime is 79521901. The reversal of 79521897 is 79812597.

It is not a de Polignac number, because 79521897 - 2⁴ = 79521881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79521817) 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, 2479 + ... + 12852.

It is an arithmetic number, because the mean of its divisors is an integer number (4292960).

Almost surely, 2^79521897 is an apocalyptic number.

It is an amenable number.

79521897 is a deficient number, since it is larger than the sum of its proper divisors (57852823).

79521897 is a wasteful number, since it uses less digits than its factorization.

79521897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15373.

The product of its digits is 317520, while the sum is 48.

The square root of 79521897 is about 8917.5050883081. The cubic root of 79521897 is about 430.0268542810.

The spelling of 79521897 in words is "seventy-nine million, five hundred twenty-one thousand, eight hundred ninety-seven".