31315164 has 12 divisors (see below), whose sum is σ = 73068744. Its totient is φ = 10438384.

The previous prime is 31315133. The next prime is 31315169. The reversal of 31315164 is 46151313.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31315169) 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, 1304787 + ... + 1304810.

It is an arithmetic number, because the mean of its divisors is an integer number (6089062).

Almost surely, 2^31315164 is an apocalyptic number.

It is an amenable number.

31315164 is an abundant number, since it is smaller than the sum of its proper divisors (41753580).

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

31315164 is a wasteful number, since it uses less digits than its factorization.

31315164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609604 (or 2609602 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 31315164 is about 5595.9953538222. The cubic root of 31315164 is about 315.1990477910.

Adding to 31315164 its reverse (46151313), we get a palindrome (77466477).

The spelling of 31315164 in words is "thirty-one million, three hundred fifteen thousand, one hundred sixty-four".