256764943 has 2 divisors, whose sum is σ = 256764944. Its totient is φ = 256764942.

The previous prime is 256764881. The next prime is 256764947. The reversal of 256764943 is 349467652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256764943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256764893 and 256764902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256764947) 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, 128382471 + 128382472.

It is an arithmetic number, because the mean of its divisors is an integer number (128382472).

Almost surely, 2^256764943 is an apocalyptic number.

256764943 is a deficient number, since it is larger than the sum of its proper divisors (1).

256764943 is an equidigital number, since it uses as much as digits as its factorization.

256764943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 46.

The square root of 256764943 is about 16023.8866383908. The cubic root of 256764943 is about 635.5922248960.

The spelling of 256764943 in words is "two hundred fifty-six million, seven hundred sixty-four thousand, nine hundred forty-three".