79813931 has 2 divisors, whose sum is σ = 79813932. Its totient is φ = 79813930.

The previous prime is 79813907. The next prime is 79813973. The reversal of 79813931 is 13931897.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79813931 - 2¹⁴ = 79797547 is a prime.

It is a super-3 number, since 3×79813931³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (79813901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39906965 + 39906966.

It is an arithmetic number, because the mean of its divisors is an integer number (39906966).

Almost surely, 2^79813931 is an apocalyptic number.

79813931 is a deficient number, since it is larger than the sum of its proper divisors (1).

79813931 is an equidigital number, since it uses as much as digits as its factorization.

79813931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 79813931 is about 8933.8642814854. The cubic root of 79813931 is about 430.5526174207.

The spelling of 79813931 in words is "seventy-nine million, eight hundred thirteen thousand, nine hundred thirty-one".