879808591 has 4 divisors (see below), whose sum is σ = 879981952. Its totient is φ = 879635232.

The previous prime is 879808571. The next prime is 879808603. The reversal of 879808591 is 195808978.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195808978 = 2 ⋅97904489.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-879808591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879808571) 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, 78831 + ... + 89296.

It is an arithmetic number, because the mean of its divisors is an integer number (219995488).

Almost surely, 2^879808591 is an apocalyptic number.

879808591 is a deficient number, since it is larger than the sum of its proper divisors (173361).

879808591 is a wasteful number, since it uses less digits than its factorization.

879808591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173360.

The product of its (nonzero) digits is 1451520, while the sum is 55.

The square root of 879808591 is about 29661.5675748939. The cubic root of 879808591 is about 958.2144875197.

The spelling of 879808591 in words is "eight hundred seventy-nine million, eight hundred eight thousand, five hundred ninety-one".