31143612 has 24 divisors (see below), whose sum is σ = 72979200. Its totient is φ = 10336816.

The previous prime is 31143601. The next prime is 31143613. The reversal of 31143612 is 21634113.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2562 + ... + 8297.

It is an arithmetic number, because the mean of its divisors is an integer number (3040800).

Almost surely, 2^31143612 is an apocalyptic number.

It is an amenable number.

31143612 is an abundant number, since it is smaller than the sum of its proper divisors (41835588).

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

31143612 is a wasteful number, since it uses less digits than its factorization.

31143612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11105 (or 11103 counting only the distinct ones).

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

The square root of 31143612 is about 5580.6461991422. The cubic root of 31143612 is about 314.6224147968.

Adding to 31143612 its reverse (21634113), we get a palindrome (52777725).

The spelling of 31143612 in words is "thirty-one million, one hundred forty-three thousand, six hundred twelve".