791138591 has 4 divisors (see below), whose sum is σ = 791226072. Its totient is φ = 791051112.

The previous prime is 791138581. The next prime is 791138641. The reversal of 791138591 is 195831197.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 791138591 - 2⁶ = 791138527 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 (791138561) 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, 28376 + ... + 48861.

It is an arithmetic number, because the mean of its divisors is an integer number (197806518).

Almost surely, 2^791138591 is an apocalyptic number.

791138591 is a deficient number, since it is larger than the sum of its proper divisors (87481).

791138591 is a wasteful number, since it uses less digits than its factorization.

791138591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87480.

The product of its digits is 68040, while the sum is 44.

The square root of 791138591 is about 28127.1859772712. The cubic root of 791138591 is about 924.8774479958.

The spelling of 791138591 in words is "seven hundred ninety-one million, one hundred thirty-eight thousand, five hundred ninety-one".