79515861 has 4 divisors (see below), whose sum is σ = 106021152. Its totient is φ = 53010572.

The previous prime is 79515859. The next prime is 79515871. The reversal of 79515861 is 16851597.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79515861 - 2¹ = 79515859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79515841) 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, 13252641 + ... + 13252646.

It is an arithmetic number, because the mean of its divisors is an integer number (26505288).

Almost surely, 2^79515861 is an apocalyptic number.

It is an amenable number.

79515861 is a deficient number, since it is larger than the sum of its proper divisors (26505291).

79515861 is a wasteful number, since it uses less digits than its factorization.

79515861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26505290.

The product of its digits is 75600, while the sum is 42.

The square root of 79515861 is about 8917.1666464186. The cubic root of 79515861 is about 430.0159738072.

The spelling of 79515861 in words is "seventy-nine million, five hundred fifteen thousand, eight hundred sixty-one".