31663144 has 16 divisors (see below), whose sum is σ = 59519700. Its totient is φ = 15791232.

The previous prime is 31663133. The next prime is 31663147. The reversal of 31663144 is 44136613.

It can be written as a sum of positive squares in 2 ways, for example, as 28196100 + 3467044 = 5310^2 + 1862^2 .

It is not an unprimeable number, because it can be changed into a prime (31663147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1567 + ... + 8110.

Almost surely, 2^31663144 is an apocalyptic number.

It is an amenable number.

31663144 is a deficient number, since it is larger than the sum of its proper divisors (27856556).

31663144 is a wasteful number, since it uses less digits than its factorization.

31663144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10092 (or 10088 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 31663144 is about 5627.0013328593. The cubic root of 31663144 is about 316.3622667961.

Adding to 31663144 its reverse (44136613), we get a palindrome (75799757).

The spelling of 31663144 in words is "thirty-one million, six hundred sixty-three thousand, one hundred forty-four".