79099931 has 4 divisors (see below), whose sum is σ = 79223592. Its totient is φ = 78976272.

The previous prime is 79099927. The next prime is 79099949. The reversal of 79099931 is 13999097.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13999097 = 7 ⋅1999871.

It is a cyclic number.

It is not a de Polignac number, because 79099931 - 2² = 79099927 is a prime.

It is a super-2 number, since 2×79099931² = 12513598168409522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79099901) 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, 60866 + ... + 62151.

It is an arithmetic number, because the mean of its divisors is an integer number (19805898).

Almost surely, 2^79099931 is an apocalyptic number.

79099931 is a deficient number, since it is larger than the sum of its proper divisors (123661).

79099931 is a wasteful number, since it uses less digits than its factorization.

79099931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123660.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 79099931 is about 8893.8141986439. The cubic root of 79099931 is about 429.2648896660.

The spelling of 79099931 in words is "seventy-nine million, ninety-nine thousand, nine hundred thirty-one".