79570091 has 4 divisors (see below), whose sum is σ = 81720672. Its totient is φ = 77419512.

The previous prime is 79570079. The next prime is 79570093. The reversal of 79570091 is 19007597.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19007597 = 7 ⋅2715371.

It is a cyclic number.

It is not a de Polignac number, because 79570091 - 2¹⁴ = 79553707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79570093) 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, 1075235 + ... + 1075308.

It is an arithmetic number, because the mean of its divisors is an integer number (20430168).

Almost surely, 2^79570091 is an apocalyptic number.

79570091 is a deficient number, since it is larger than the sum of its proper divisors (2150581).

79570091 is a wasteful number, since it uses less digits than its factorization.

79570091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150580.

The product of its (nonzero) digits is 19845, while the sum is 38.

The square root of 79570091 is about 8920.2068922195. The cubic root of 79570091 is about 430.1137088862.

The spelling of 79570091 in words is "seventy-nine million, five hundred seventy thousand, ninety-one".