31143472 has 20 divisors (see below), whose sum is σ = 62964720. Its totient is φ = 14894528.

The previous prime is 31143467. The next prime is 31143487. The reversal of 31143472 is 27434113.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41947 + ... + 42682.

It is an arithmetic number, because the mean of its divisors is an integer number (3148236).

Almost surely, 2^31143472 is an apocalyptic number.

It is an amenable number.

31143472 is an abundant number, since it is smaller than the sum of its proper divisors (31821248).

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

31143472 is a wasteful number, since it uses less digits than its factorization.

31143472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84660 (or 84654 counting only the distinct ones).

The product of its digits is 2016, while the sum is 25.

The square root of 31143472 is about 5580.6336557778. The cubic root of 31143472 is about 314.6219433549.

Adding to 31143472 its reverse (27434113), we get a palindrome (58577585).

The spelling of 31143472 in words is "thirty-one million, one hundred forty-three thousand, four hundred seventy-two".