31123164 has 24 divisors (see below), whose sum is σ = 72712080. Its totient is φ = 10361344.

The previous prime is 31123151. The next prime is 31123181. The reversal of 31123164 is 46132113.

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 31123164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15532 + ... + 17420.

It is an arithmetic number, because the mean of its divisors is an integer number (3029670).

Almost surely, 2^31123164 is an apocalyptic number.

It is an amenable number.

31123164 is an abundant number, since it is smaller than the sum of its proper divisors (41588916).

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

31123164 is a wasteful number, since it uses less digits than its factorization.

31123164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269 (or 3267 counting only the distinct ones).

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

The square root of 31123164 is about 5578.8138524242. The cubic root of 31123164 is about 314.5535423782.

Adding to 31123164 its reverse (46132113), we get a palindrome (77255277).

The spelling of 31123164 in words is "thirty-one million, one hundred twenty-three thousand, one hundred sixty-four".