42042631 has 4 divisors (see below), whose sum is σ = 42056200. Its totient is φ = 42029064.

The previous prime is 42042601. The next prime is 42042647. The reversal of 42042631 is 13624024.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42042631 - 2⁵ = 42042599 is a prime.

It is a super-2 number, since 2×42042631² = 3535165642804322, 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 (42042601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400 + ... + 9178.

It is an arithmetic number, because the mean of its divisors is an integer number (10514050).

Almost surely, 2^42042631 is an apocalyptic number.

42042631 is a deficient number, since it is larger than the sum of its proper divisors (13569).

42042631 is an equidigital number, since it uses as much as digits as its factorization.

42042631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13568.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 42042631 is about 6484.0289172705. The cubic root of 42042631 is about 347.7202330462.

Adding to 42042631 its reverse (13624024), we get a palindrome (55666655).

The spelling of 42042631 in words is "forty-two million, forty-two thousand, six hundred thirty-one".