79123691 has 4 divisors (see below), whose sum is σ = 79236000. Its totient is φ = 79011384.

The previous prime is 79123663. The next prime is 79123697. The reversal of 79123691 is 19632197.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79123691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79123697) 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, 55091 + ... + 56508.

It is an arithmetic number, because the mean of its divisors is an integer number (19809000).

Almost surely, 2^79123691 is an apocalyptic number.

79123691 is a deficient number, since it is larger than the sum of its proper divisors (112309).

79123691 is a wasteful number, since it uses less digits than its factorization.

79123691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112308.

The product of its digits is 20412, while the sum is 38.

The square root of 79123691 is about 8895.1498582092. The cubic root of 79123691 is about 429.3078661583.

The spelling of 79123691 in words is "seventy-nine million, one hundred twenty-three thousand, six hundred ninety-one".