42581631 has 24 divisors (see below), whose sum is σ = 60100096. Its totient is φ = 26788320.

The previous prime is 42581593. The next prime is 42581633. The reversal of 42581631 is 13618524.

It is not a de Polignac number, because 42581631 - 2⁷ = 42581503 is a prime.

It is a super-2 number, since 2×42581631² = 3626390597240322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42581633) 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, 261156 + ... + 261318.

Almost surely, 2^42581631 is an apocalyptic number.

42581631 is a deficient number, since it is larger than the sum of its proper divisors (17518465).

42581631 is a wasteful number, since it uses less digits than its factorization.

42581631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 250 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 42581631 is about 6525.4602136554. The cubic root of 42581631 is about 349.1998893232.

The spelling of 42581631 in words is "forty-two million, five hundred eighty-one thousand, six hundred thirty-one".