256894559 has 2 divisors, whose sum is σ = 256894560. Its totient is φ = 256894558.

The previous prime is 256894541. The next prime is 256894571. The reversal of 256894559 is 955498652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256894559 - 2²⁰ = 255845983 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256894559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256897559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128447279 + 128447280.

It is an arithmetic number, because the mean of its divisors is an integer number (128447280).

Almost surely, 2^256894559 is an apocalyptic number.

256894559 is a deficient number, since it is larger than the sum of its proper divisors (1).

256894559 is an equidigital number, since it uses as much as digits as its factorization.

256894559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888000, while the sum is 53.

The square root of 256894559 is about 16027.9305900668. The cubic root of 256894559 is about 635.6991567618.

The spelling of 256894559 in words is "two hundred fifty-six million, eight hundred ninety-four thousand, five hundred fifty-nine".