79520131 has 4 divisors (see below), whose sum is σ = 82977552. Its totient is φ = 76062712.

The previous prime is 79520123. The next prime is 79520137. The reversal of 79520131 is 13102597.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13102597 = 17 ⋅770741.

It is a cyclic number.

It is not a de Polignac number, because 79520131 - 2³ = 79520123 is a prime.

It is a super-2 number, since 2×79520131² = 12646902468514322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79520131.

It is not an unprimeable number, because it can be changed into a prime (79520137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1728676 + ... + 1728721.

It is an arithmetic number, because the mean of its divisors is an integer number (20744388).

Almost surely, 2^79520131 is an apocalyptic number.

79520131 is a deficient number, since it is larger than the sum of its proper divisors (3457421).

79520131 is a wasteful number, since it uses less digits than its factorization.

79520131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3457420.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 79520131 is about 8917.4060690315. The cubic root of 79520131 is about 430.0236709522.

The spelling of 79520131 in words is "seventy-nine million, five hundred twenty thousand, one hundred thirty-one".