256243523 has 2 divisors, whose sum is σ = 256243524. Its totient is φ = 256243522.

The previous prime is 256243517. The next prime is 256243541. The reversal of 256243523 is 325342652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256243523 - 2⁶ = 256243459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256243523.

It is not a weakly prime, because it can be changed into another prime (256243513) 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, 128121761 + 128121762.

It is an arithmetic number, because the mean of its divisors is an integer number (128121762).

Almost surely, 2^256243523 is an apocalyptic number.

256243523 is a deficient number, since it is larger than the sum of its proper divisors (1).

256243523 is an equidigital number, since it uses as much as digits as its factorization.

256243523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 32.

The square root of 256243523 is about 16007.6082848126. The cubic root of 256243523 is about 635.1616948264.

The spelling of 256243523 in words is "two hundred fifty-six million, two hundred forty-three thousand, five hundred twenty-three".