79621131 has 4 divisors (see below), whose sum is σ = 106161512. Its totient is φ = 53080752.

The previous prime is 79621123. The next prime is 79621187. The reversal of 79621131 is 13112697.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 79621131 - 2³ = 79621123 is a prime.

It is a super-2 number, since 2×79621131² = 12679049003438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79621111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13270186 + ... + 13270191.

It is an arithmetic number, because the mean of its divisors is an integer number (26540378).

Almost surely, 2^79621131 is an apocalyptic number.

79621131 is a deficient number, since it is larger than the sum of its proper divisors (26540381).

79621131 is a wasteful number, since it uses less digits than its factorization.

79621131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26540380.

The product of its digits is 2268, while the sum is 30.

The square root of 79621131 is about 8923.0673537747. The cubic root of 79621131 is about 430.2056542860.

The spelling of 79621131 in words is "seventy-nine million, six hundred twenty-one thousand, one hundred thirty-one".