79159021 has 16 divisors (see below), whose sum is σ = 86569776. Its totient is φ = 72078336.

The previous prime is 79159007. The next prime is 79159037. The reversal of 79159021 is 12095197.

It can be written as a sum of positive squares in 8 ways, for example, as 2788900 + 76370121 = 1670^2 + 8739^2 .

It is a cyclic number.

It is not a de Polignac number, because 79159021 - 2¹⁹ = 78634733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79159321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199195 + ... + 199591.

It is an arithmetic number, because the mean of its divisors is an integer number (5410611).

Almost surely, 2^79159021 is an apocalyptic number.

It is an amenable number.

79159021 is a deficient number, since it is larger than the sum of its proper divisors (7410755).

79159021 is a wasteful number, since it uses less digits than its factorization.

79159021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 79159021 is about 8897.1355502768. The cubic root of 79159021 is about 429.3717542715.

The spelling of 79159021 in words is "seventy-nine million, one hundred fifty-nine thousand, twenty-one".