79993091 has 4 divisors (see below), whose sum is σ = 81944184. Its totient is φ = 78042000.

The previous prime is 79993033. The next prime is 79993099. The reversal of 79993091 is 19039997.

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 79993091 - 2⁶ = 79993027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79993099) 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, 975485 + ... + 975566.

It is an arithmetic number, because the mean of its divisors is an integer number (20486046).

Almost surely, 2^79993091 is an apocalyptic number.

79993091 is a deficient number, since it is larger than the sum of its proper divisors (1951093).

79993091 is a wasteful number, since it uses less digits than its factorization.

79993091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951092.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 79993091 is about 8943.8856768185. The cubic root of 79993091 is about 430.8745334915.

The spelling of 79993091 in words is "seventy-nine million, nine hundred ninety-three thousand, ninety-one".