79812731 has 4 divisors (see below), whose sum is σ = 80214000. Its totient is φ = 79411464.

The previous prime is 79812713. The next prime is 79812751. The reversal of 79812731 is 13721897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13721897 = 7 ⋅1960271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79812731 is a prime.

It is a super-2 number, since 2×79812731² = 12740144059356722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79812701) 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, 200336 + ... + 200733.

It is an arithmetic number, because the mean of its divisors is an integer number (20053500).

Almost surely, 2^79812731 is an apocalyptic number.

79812731 is a deficient number, since it is larger than the sum of its proper divisors (401269).

79812731 is a wasteful number, since it uses less digits than its factorization.

79812731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401268.

The product of its digits is 21168, while the sum is 38.

The square root of 79812731 is about 8933.7971210455. The cubic root of 79812731 is about 430.5504596281.

The spelling of 79812731 in words is "seventy-nine million, eight hundred twelve thousand, seven hundred thirty-one".