31320743 has 2 divisors, whose sum is σ = 31320744. Its totient is φ = 31320742.

The previous prime is 31320739. The next prime is 31320763. The reversal of 31320743 is 34702313.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31320743 - 2² = 31320739 is a 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 (31320713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660371 + 15660372.

It is an arithmetic number, because the mean of its divisors is an integer number (15660372).

Almost surely, 2^31320743 is an apocalyptic number.

31320743 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320743 is an equidigital number, since it uses as much as digits as its factorization.

31320743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 31320743 is about 5596.4938130941. The cubic root of 31320743 is about 315.2177649325.

The spelling of 31320743 in words is "thirty-one million, three hundred twenty thousand, seven hundred forty-three".