79749931 has 4 divisors (see below), whose sum is σ = 79768000. Its totient is φ = 79731864.

The previous prime is 79749919. The next prime is 79749953. The reversal of 79749931 is 13994797.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 79749931 - 2¹⁵ = 79717163 is a prime.

It is a super-2 number, since 2×79749931² = 12720102989009522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79749031) 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, 2470 + ... + 12868.

It is an arithmetic number, because the mean of its divisors is an integer number (19942000).

Almost surely, 2^79749931 is an apocalyptic number.

79749931 is a deficient number, since it is larger than the sum of its proper divisors (18069).

79749931 is a wasteful number, since it uses less digits than its factorization.

79749931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18068.

The product of its digits is 428652, while the sum is 49.

The square root of 79749931 is about 8930.2816864867. The cubic root of 79749931 is about 430.4375049515.

The spelling of 79749931 in words is "seventy-nine million, seven hundred forty-nine thousand, nine hundred thirty-one".