42043031 has 4 divisors (see below), whose sum is σ = 42062064. Its totient is φ = 42024000.

The previous prime is 42043021. The next prime is 42043033. The reversal of 42043031 is 13034024.

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 42043031 - 2¹⁸ = 41780887 is a prime.

It is a super-2 number, since 2×42043031² = 3535232911333922, 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 (42043033) 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 3 ways as a sum of consecutive naturals, for example, 5690 + ... + 10791.

It is an arithmetic number, because the mean of its divisors is an integer number (10515516).

Almost surely, 2^42043031 is an apocalyptic number.

42043031 is a deficient number, since it is larger than the sum of its proper divisors (19033).

42043031 is a wasteful number, since it uses less digits than its factorization.

42043031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19032.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 42043031 is about 6484.0597622169. The cubic root of 42043031 is about 347.7213357972.

Adding to 42043031 its reverse (13034024), we get a palindrome (55077055).

The spelling of 42043031 in words is "forty-two million, forty-three thousand, thirty-one".