31112660 has 12 divisors (see below), whose sum is σ = 65336628. Its totient is φ = 12445056.

The previous prime is 31112657. The next prime is 31112687. The reversal of 31112660 is 6621113.

It can be written as a sum of positive squares in 2 ways, for example, as 20757136 + 10355524 = 4556^2 + 3218^2 .

It is a super-2 number, since 2×31112660² = 1935995224551200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1555633 = 31112660 / (3 + 1 + 1 + 1 + 2 + 6 + 6 + 0).

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, 777797 + ... + 777836.

It is an arithmetic number, because the mean of its divisors is an integer number (5444719).

Almost surely, 2^31112660 is an apocalyptic number.

It is an amenable number.

31112660 is an abundant number, since it is smaller than the sum of its proper divisors (34223968).

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

31112660 is a wasteful number, since it uses less digits than its factorization.

31112660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555642 (or 1555640 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31112660 is about 5577.8723542225. The cubic root of 31112660 is about 314.5181513515.

Adding to 31112660 its reverse (6621113), we get a palindrome (37733773).

The spelling of 31112660 in words is "thirty-one million, one hundred twelve thousand, six hundred sixty".