791591138 has 32 divisors (see below), whose sum is σ = 1377395712. Its totient is φ = 338184000.

The previous prime is 791591137. The next prime is 791591147. The reversal of 791591138 is 831195197.

It is not an unprimeable number, because it can be changed into a prime (791591137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2813 + ... + 39888.

It is an arithmetic number, because the mean of its divisors is an integer number (43043616).

Almost surely, 2^791591138 is an apocalyptic number.

791591138 is a deficient number, since it is larger than the sum of its proper divisors (585804574).

791591138 is a wasteful number, since it uses less digits than its factorization.

791591138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42770.

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

The square root of 791591138 is about 28135.2294819147. The cubic root of 791591138 is about 925.0537638095.

The spelling of 791591138 in words is "seven hundred ninety-one million, five hundred ninety-one thousand, one hundred thirty-eight".