31231164 has 12 divisors (see below), whose sum is σ = 72872744. Its totient is φ = 10410384.

The previous prime is 31231139. The next prime is 31231223. The reversal of 31231164 is 46113213.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31231164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1301287 + ... + 1301310.

Almost surely, 2^31231164 is an apocalyptic number.

It is an amenable number.

31231164 is an abundant number, since it is smaller than the sum of its proper divisors (41641580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31231164 is a wasteful number, since it uses less digits than its factorization.

31231164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602604 (or 2602602 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 31231164 is about 5588.4849467454. The cubic root of 31231164 is about 314.9169647600.

Adding to 31231164 its reverse (46113213), we get a palindrome (77344377).

The spelling of 31231164 in words is "thirty-one million, two hundred thirty-one thousand, one hundred sixty-four".