79793991 has 20 divisors (see below), whose sum is σ = 121453992. Its totient is φ = 52189488.

The previous prime is 79793963. The next prime is 79794007. The reversal of 79793991 is 19939797.

It is not a de Polignac number, because 79793991 - 2⁶ = 79793927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79793491) 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 19 ways as a sum of consecutive naturals, for example, 5001 + ... + 13586.

Almost surely, 2^79793991 is an apocalyptic number.

79793991 is a deficient number, since it is larger than the sum of its proper divisors (41660001).

79793991 is a wasteful number, since it uses less digits than its factorization.

79793991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18652 (or 18643 counting only the distinct ones).

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

The square root of 79793991 is about 8932.7482333266. The cubic root of 79793991 is about 430.5167592937.

The spelling of 79793991 in words is "seventy-nine million, seven hundred ninety-three thousand, nine hundred ninety-one".