31213264 has 20 divisors (see below), whose sum is σ = 61763904. Its totient is φ = 15274208.

The previous prime is 31213261. The next prime is 31213289. The reversal of 31213264 is 46231213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213261) 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, 20002 + ... + 21505.

Almost surely, 2^31213264 is an apocalyptic number.

It is an amenable number.

31213264 is a deficient number, since it is larger than the sum of its proper divisors (30550640).

31213264 is a wasteful number, since it uses less digits than its factorization.

31213264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41562 (or 41556 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 31213264 is about 5586.8832098049. The cubic root of 31213264 is about 314.8567888520.

Adding to 31213264 its reverse (46231213), we get a palindrome (77444477).

The spelling of 31213264 in words is "thirty-one million, two hundred thirteen thousand, two hundred sixty-four".