31939043 has 4 divisors (see below), whose sum is σ = 31973040. Its totient is φ = 31905048.

The previous prime is 31939031. The next prime is 31939049. The reversal of 31939043 is 34093913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34093913 = 7 ⋅4870559.

It is a cyclic number.

It is not a de Polignac number, because 31939043 - 2⁴ = 31939027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31939049) 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, 15548 + ... + 17481.

It is an arithmetic number, because the mean of its divisors is an integer number (7993260).

Almost surely, 2^31939043 is an apocalyptic number.

31939043 is a deficient number, since it is larger than the sum of its proper divisors (33997).

31939043 is an equidigital number, since it uses as much as digits as its factorization.

31939043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33996.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 31939043 is about 5651.4637926824. The cubic root of 31939043 is about 317.2784922423.

The spelling of 31939043 in words is "thirty-one million, nine hundred thirty-nine thousand, forty-three".