31731472 has 20 divisors (see below), whose sum is σ = 61825036. Its totient is φ = 15776640.

The previous prime is 31731457. The next prime is 31731517. The reversal of 31731472 is 27413713.

It can be written as a sum of positive squares in 2 ways, for example, as 7485696 + 24245776 = 2736^2 + 4924^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31731472.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2583 + ... + 8374.

Almost surely, 2^31731472 is an apocalyptic number.

It is an amenable number.

31731472 is a deficient number, since it is larger than the sum of its proper divisors (30093564).

31731472 is a wasteful number, since it uses less digits than its factorization.

31731472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11146 (or 11140 counting only the distinct ones).

The product of its digits is 3528, while the sum is 28.

The square root of 31731472 is about 5633.0695007252. The cubic root of 31731472 is about 316.5896696763.

The spelling of 31731472 in words is "thirty-one million, seven hundred thirty-one thousand, four hundred seventy-two".