31131472 has 40 divisors (see below), whose sum is σ = 61996032. Its totient is φ = 15139200.

The previous prime is 31131431. The next prime is 31131487. The reversal of 31131472 is 27413113.

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, 162897 + ... + 163087.

Almost surely, 2^31131472 is an apocalyptic number.

It is an amenable number.

31131472 is a deficient number, since it is larger than the sum of its proper divisors (30864560).

31131472 is a wasteful number, since it uses less digits than its factorization.

31131472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 421 counting only the distinct ones).

The product of its digits is 504, while the sum is 22.

The square root of 31131472 is about 5579.5584054654. The cubic root of 31131472 is about 314.5815288037.

Adding to 31131472 its reverse (27413113), we get a palindrome (58544585).

The spelling of 31131472 in words is "thirty-one million, one hundred thirty-one thousand, four hundred seventy-two".