256354589 has 2 divisors, whose sum is σ = 256354590. Its totient is φ = 256354588.

The previous prime is 256354541. The next prime is 256354597. The reversal of 256354589 is 985453652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253605625 + 2748964 = 15925^2 + 1658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256354589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256354789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128177294 + 128177295.

It is an arithmetic number, because the mean of its divisors is an integer number (128177295).

Almost surely, 2^256354589 is an apocalyptic number.

It is an amenable number.

256354589 is a deficient number, since it is larger than the sum of its proper divisors (1).

256354589 is an equidigital number, since it uses as much as digits as its factorization.

256354589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296000, while the sum is 47.

The square root of 256354589 is about 16011.0770718275. The cubic root of 256354589 is about 635.2534495735.

The spelling of 256354589 in words is "two hundred fifty-six million, three hundred fifty-four thousand, five hundred eighty-nine".