31513023 has 16 divisors (see below), whose sum is σ = 47773440. Its totient is φ = 20519352.

The previous prime is 31513007. The next prime is 31513033. The reversal of 31513023 is 32031513.

It is not a de Polignac number, because 31513023 - 2⁴ = 31513007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31512987 and 31513005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31513003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12411 + ... + 14732.

It is an arithmetic number, because the mean of its divisors is an integer number (2985840).

Almost surely, 2^31513023 is an apocalyptic number.

31513023 is a deficient number, since it is larger than the sum of its proper divisors (16260417).

31513023 is a wasteful number, since it uses less digits than its factorization.

31513023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27195 (or 27189 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 31513023 is about 5613.6461413238. The cubic root of 31513023 is about 315.8614966118.

Adding to 31513023 its reverse (32031513), we get a palindrome (63544536).

It can be divided in two parts, 3151302 and 3, that added together give a triangular number (3151305 = T₂₅₁₀).

The spelling of 31513023 in words is "thirty-one million, five hundred thirteen thousand, twenty-three".