31244409 has 18 divisors (see below), whose sum is σ = 52499850. Its totient is φ = 17853696.

The previous prime is 31244399. The next prime is 31244431. The reversal of 31244409 is 90444213.

It can be written as a sum of positive squares in only one way, i.e., 29811600 + 1432809 = 5460^2 + 1197^2 .

It is not a de Polignac number, because 31244409 - 2⁸ = 31244153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31244449) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 34984 + ... + 35865.

Almost surely, 2^31244409 is an apocalyptic number.

It is an amenable number.

31244409 is a deficient number, since it is larger than the sum of its proper divisors (21255441).

31244409 is a wasteful number, since it uses less digits than its factorization.

31244409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70869 (or 70859 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 31244409 is about 5589.6698471377. The cubic root of 31244409 is about 314.9614767704.

The spelling of 31244409 in words is "thirty-one million, two hundred forty-four thousand, four hundred nine".