31564423 has 6 divisors (see below), whose sum is σ = 34694912. Its totient is φ = 28694820.

The previous prime is 31564391. The next prime is 31564433. The reversal of 31564423 is 32446513.

It is not a de Polignac number, because 31564423 - 2⁵ = 31564391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31564391 and 31564400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31564433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130311 + ... + 130552.

Almost surely, 2^31564423 is an apocalyptic number.

31564423 is a deficient number, since it is larger than the sum of its proper divisors (3130489).

31564423 is a wasteful number, since it uses less digits than its factorization.

31564423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260885 (or 260874 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 31564423 is about 5618.2224057081. Note that the first 3 decimals coincide. The cubic root of 31564423 is about 316.0331342439.

The spelling of 31564423 in words is "thirty-one million, five hundred sixty-four thousand, four hundred twenty-three".