79581021 has 8 divisors (see below), whose sum is σ = 114270240. Its totient is φ = 48972912.

The previous prime is 79581013. The next prime is 79581053. The reversal of 79581021 is 12018597.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79581021 - 2³ = 79581013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79581071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1020231 + ... + 1020308.

It is an arithmetic number, because the mean of its divisors is an integer number (14283780).

Almost surely, 2^79581021 is an apocalyptic number.

It is an amenable number.

79581021 is a deficient number, since it is larger than the sum of its proper divisors (34689219).

79581021 is a wasteful number, since it uses less digits than its factorization.

79581021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040555.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 79581021 is about 8920.8195251333. The cubic root of 79581021 is about 430.1334019122.

The spelling of 79581021 in words is "seventy-nine million, five hundred eighty-one thousand, twenty-one".