31913023 has 4 divisors (see below), whose sum is σ = 31938400. Its totient is φ = 31887648.

The previous prime is 31913017. The next prime is 31913039. The reversal of 31913023 is 32031913.

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 31913023 - 2⁹ = 31912511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31912985 and 31913003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31913003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10698 + ... + 13351.

It is an arithmetic number, because the mean of its divisors is an integer number (7984600).

Almost surely, 2^31913023 is an apocalyptic number.

31913023 is a deficient number, since it is larger than the sum of its proper divisors (25377).

31913023 is a wasteful number, since it uses less digits than its factorization.

31913023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25376.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 31913023 is about 5649.1612651791. The cubic root of 31913023 is about 317.1923090165.

Adding to 31913023 its reverse (32031913), we get a palindrome (63944936).

The spelling of 31913023 in words is "thirty-one million, nine hundred thirteen thousand, twenty-three".