42031 has 4 divisors (see below), whose sum is σ = 45864. Its totient is φ = 38200.

The previous prime is 42023. The next prime is 42043. The reversal of 42031 is 13024.

42031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42031 - 2³ = 42023 is a prime.

It is a super-2 number, since 2×42031² = 3533209922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 41999 and 42017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42061) 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, 1900 + ... + 1921.

It is an arithmetic number, because the mean of its divisors is an integer number (11466).

2⁴²⁰³¹ is an apocalyptic number.

42031 is a deficient number, since it is larger than the sum of its proper divisors (3833).

42031 is a wasteful number, since it uses less digits than its factorization.

42031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3832.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 42031 is about 205.0146336240. The cubic root of 42031 is about 34.7688164747.

Adding to 42031 its reverse (13024), we get a palindrome (55055).

The spelling of 42031 in words is "forty-two thousand, thirty-one".