31249943 has 2 divisors, whose sum is σ = 31249944. Its totient is φ = 31249942.

The previous prime is 31249937. The next prime is 31249957. The reversal of 31249943 is 34994213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31249943 is a prime.

It is a super-3 number, since 3×31249943³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31249993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15624971 + 15624972.

It is an arithmetic number, because the mean of its divisors is an integer number (15624972).

Almost surely, 2^31249943 is an apocalyptic number.

31249943 is a deficient number, since it is larger than the sum of its proper divisors (1).

31249943 is an equidigital number, since it uses as much as digits as its factorization.

31249943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 31249943 is about 5590.1648455122. The cubic root of 31249943 is about 314.9800709656.

The spelling of 31249943 in words is "thirty-one million, two hundred forty-nine thousand, nine hundred forty-three".