31043249 has 2 divisors, whose sum is σ = 31043250. Its totient is φ = 31043248.

The previous prime is 31043237. The next prime is 31043251. The reversal of 31043249 is 94234013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 351649 = 5540^2 + 593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31043249 is a prime.

Together with 31043251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31043209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15521624 + 15521625.

It is an arithmetic number, because the mean of its divisors is an integer number (15521625).

Almost surely, 2^31043249 is an apocalyptic number.

It is an amenable number.

31043249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31043249 is an equidigital number, since it uses as much as digits as its factorization.

31043249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 31043249 is about 5571.6468840012. The cubic root of 31043249 is about 314.2840850663.

The spelling of 31043249 in words is "thirty-one million, forty-three thousand, two hundred forty-nine".