42631581 has 12 divisors (see below), whose sum is σ = 59423168. Its totient is φ = 27184344.

The previous prime is 42631531. The next prime is 42631583. The reversal of 42631581 is 18513624.

It is not a de Polignac number, because 42631581 - 2¹⁴ = 42615197 is a prime.

It is a super-2 number, since 2×42631581² = 3634903397119122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42631583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11845 + ... + 15018.

Almost surely, 2^42631581 is an apocalyptic number.

It is an amenable number.

42631581 is a deficient number, since it is larger than the sum of its proper divisors (16791587).

42631581 is a wasteful number, since it uses less digits than its factorization.

42631581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26912 (or 26889 counting only the distinct ones).

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

The square root of 42631581 is about 6529.2864081766. The cubic root of 42631581 is about 349.3363779000.

The spelling of 42631581 in words is "forty-two million, six hundred thirty-one thousand, five hundred eighty-one".