79979913 has 32 divisors (see below), whose sum is σ = 128378880. Its totient is φ = 48919680.

The previous prime is 79979909. The next prime is 79979923. The reversal of 79979913 is 31997997.

It is not a de Polignac number, because 79979913 - 2² = 79979909 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79979913.

It is not an unprimeable number, because it can be changed into a prime (79979923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66445 + ... + 67637.

It is an arithmetic number, because the mean of its divisors is an integer number (4011840).

Almost surely, 2^79979913 is an apocalyptic number.

It is an amenable number.

79979913 is a deficient number, since it is larger than the sum of its proper divisors (48398967).

79979913 is a wasteful number, since it uses less digits than its factorization.

79979913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406 (or 1400 counting only the distinct ones).

The product of its digits is 964467, while the sum is 54.

The square root of 79979913 is about 8943.1489420673. The cubic root of 79979913 is about 430.8508715462.

The spelling of 79979913 in words is "seventy-nine million, nine hundred seventy-nine thousand, nine hundred thirteen".