31564223 has 4 divisors (see below), whose sum is σ = 33420960. Its totient is φ = 29707488.

The previous prime is 31564207. The next prime is 31564229. The reversal of 31564223 is 32246513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32246513 = 13 ⋅2480501.

It is a cyclic number.

It is not a de Polignac number, because 31564223 - 2⁴ = 31564207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31564192 and 31564201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31564229) 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, 928343 + ... + 928376.

It is an arithmetic number, because the mean of its divisors is an integer number (8355240).

Almost surely, 2^31564223 is an apocalyptic number.

31564223 is a deficient number, since it is larger than the sum of its proper divisors (1856737).

31564223 is a wasteful number, since it uses less digits than its factorization.

31564223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856736.

The product of its digits is 4320, while the sum is 26.

The square root of 31564223 is about 5618.2046064557. The cubic root of 31564223 is about 316.0324667544.

The spelling of 31564223 in words is "thirty-one million, five hundred sixty-four thousand, two hundred twenty-three".