42791931 has 24 divisors (see below), whose sum is σ = 76076000. Its totient is φ = 22571136.

The previous prime is 42791909. The next prime is 42791939. The reversal of 42791931 is 13919724.

It is not a de Polignac number, because 42791931 - 2⁷ = 42791803 is a prime.

It is a super-2 number, since 2×42791931² = 3662298717417522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (42791939) 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 23 ways as a sum of consecutive naturals, for example, 25306 + ... + 26943.

Almost surely, 2^42791931 is an apocalyptic number.

42791931 is a deficient number, since it is larger than the sum of its proper divisors (33284069).

42791931 is a wasteful number, since it uses less digits than its factorization.

42791931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52275 (or 52272 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 42791931 is about 6541.5541731304. The cubic root of 42791931 is about 349.7738157668.

The spelling of 42791931 in words is "forty-two million, seven hundred ninety-one thousand, nine hundred thirty-one".