31244013 has 12 divisors (see below), whose sum is σ = 45208800. Its totient is φ = 20793096.

The previous prime is 31243967. The next prime is 31244077. The reversal of 31244013 is 31044213.

It is not a de Polignac number, because 31244013 - 2¹⁸ = 30981869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31244813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3088 + ... + 8486.

It is an arithmetic number, because the mean of its divisors is an integer number (3767400).

Almost surely, 2^31244013 is an apocalyptic number.

It is an amenable number.

31244013 is a deficient number, since it is larger than the sum of its proper divisors (13964787).

31244013 is a wasteful number, since it uses less digits than its factorization.

31244013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048 (or 6045 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31244013 is about 5589.6344245398. The cubic root of 31244013 is about 314.9601461295.

Adding to 31244013 its reverse (31044213), we get a palindrome (62288226).

The spelling of 31244013 in words is "thirty-one million, two hundred forty-four thousand, thirteen".