42031431 has 12 divisors (see below), whose sum is σ = 65382408. Its totient is φ = 25865424.

The previous prime is 42031417. The next prime is 42031441. The reversal of 42031431 is 13413024.

It is not a de Polignac number, because 42031431 - 2⁵ = 42031399 is a prime.

It is a super-2 number, since 2×42031431² = 3533282383815522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42031441) 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, 179505 + ... + 179738.

It is an arithmetic number, because the mean of its divisors is an integer number (5448534).

Almost surely, 2^42031431 is an apocalyptic number.

42031431 is a deficient number, since it is larger than the sum of its proper divisors (23350977).

42031431 is a wasteful number, since it uses less digits than its factorization.

42031431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359262 (or 359259 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 42031431 is about 6483.1651991909. The cubic root of 42031431 is about 347.6893531798.

Adding to 42031431 its reverse (13413024), we get a palindrome (55444455).

The spelling of 42031431 in words is "forty-two million, thirty-one thousand, four hundred thirty-one".