256279589 has 2 divisors, whose sum is σ = 256279590. Its totient is φ = 256279588.

The previous prime is 256279531. The next prime is 256279591. The reversal of 256279589 is 985972652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232318564 + 23961025 = 15242^2 + 4895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256279589 is a prime.

Together with 256279591, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256279589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256270589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128139794 + 128139795.

It is an arithmetic number, because the mean of its divisors is an integer number (128139795).

Almost surely, 2^256279589 is an apocalyptic number.

It is an amenable number.

256279589 is a deficient number, since it is larger than the sum of its proper divisors (1).

256279589 is an equidigital number, since it uses as much as digits as its factorization.

256279589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 53.

The square root of 256279589 is about 16008.7347719924. The cubic root of 256279589 is about 635.1914928700.

The spelling of 256279589 in words is "two hundred fifty-six million, two hundred seventy-nine thousand, five hundred eighty-nine".