256305943 has 2 divisors, whose sum is σ = 256305944. Its totient is φ = 256305942.

The previous prime is 256305937. The next prime is 256306003. The reversal of 256305943 is 349503652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256305943 - 2¹⁷ = 256174871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256305443) 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, 128152971 + 128152972.

It is an arithmetic number, because the mean of its divisors is an integer number (128152972).

Almost surely, 2^256305943 is an apocalyptic number.

256305943 is a deficient number, since it is larger than the sum of its proper divisors (1).

256305943 is an equidigital number, since it uses as much as digits as its factorization.

256305943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 256305943 is about 16009.5578639761. The cubic root of 256305943 is about 635.2132650068.

The spelling of 256305943 in words is "two hundred fifty-six million, three hundred five thousand, nine hundred forty-three".