79991613 has 48 divisors (see below), whose sum is σ = 133189056. Its totient is φ = 45826560.

The previous prime is 79991609. The next prime is 79991617. The reversal of 79991613 is 31619997.

It is an interprime number because it is at equal distance from previous prime (79991609) and next prime (79991617).

It is not a de Polignac number, because 79991613 - 2² = 79991609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79991617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 260406 + ... + 260712.

It is an arithmetic number, because the mean of its divisors is an integer number (2774772).

Almost surely, 2^79991613 is an apocalyptic number.

It is an amenable number.

79991613 is a deficient number, since it is larger than the sum of its proper divisors (53197443).

79991613 is a wasteful number, since it uses less digits than its factorization.

79991613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 471 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 79991613 is about 8943.8030501571. The cubic root of 79991613 is about 430.8718797770.

The spelling of 79991613 in words is "seventy-nine million, nine hundred ninety-one thousand, six hundred thirteen".