31140244 has 18 divisors (see below), whose sum is σ = 56317002. Its totient is φ = 15066000.

The previous prime is 31140233. The next prime is 31140251. The reversal of 31140244 is 44204113.

It can be written as a sum of positive squares in only one way, i.e., 31136400 + 3844 = 5580^2 + 62^2 .

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 207 + ... + 7894.

Almost surely, 2^31140244 is an apocalyptic number.

It is an amenable number.

31140244 is a deficient number, since it is larger than the sum of its proper divisors (25176758).

31140244 is a wasteful number, since it uses less digits than its factorization.

31140244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8167 (or 8134 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 31140244 is about 5580.3444338141. The cubic root of 31140244 is about 314.6110728615.

Adding to 31140244 its reverse (44204113), we get a palindrome (75344357).

The spelling of 31140244 in words is "thirty-one million, one hundred forty thousand, two hundred forty-four".