791139021 has 16 divisors (see below), whose sum is σ = 1060202880. Its totient is φ = 524759040.

The previous prime is 791139017. The next prime is 791139031. The reversal of 791139021 is 120931197.

It is not a de Polignac number, because 791139021 - 2² = 791139017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791139031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685581 + ... + 686733.

It is an arithmetic number, because the mean of its divisors is an integer number (66262680).

Almost surely, 2^791139021 is an apocalyptic number.

It is an amenable number.

791139021 is a deficient number, since it is larger than the sum of its proper divisors (269063859).

791139021 is a wasteful number, since it uses less digits than its factorization.

791139021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 791139021 is about 28127.1936211205. The cubic root of 791139021 is about 924.8776155590.

The spelling of 791139021 in words is "seven hundred ninety-one million, one hundred thirty-nine thousand, twenty-one".