256918489 has 2 divisors, whose sum is σ = 256918490. Its totient is φ = 256918488.

The previous prime is 256918477. The next prime is 256918517. The reversal of 256918489 is 984819652.

256918489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155251600 + 101666889 = 12460^2 + 10083^2 .

It is a cyclic number.

It is not a de Polignac number, because 256918489 - 2¹⁵ = 256885721 is a prime.

It is not a weakly prime, because it can be changed into another prime (256918439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128459244 + 128459245.

It is an arithmetic number, because the mean of its divisors is an integer number (128459245).

Almost surely, 2^256918489 is an apocalyptic number.

It is an amenable number.

256918489 is a deficient number, since it is larger than the sum of its proper divisors (1).

256918489 is an equidigital number, since it uses as much as digits as its factorization.

256918489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 52.

The square root of 256918489 is about 16028.6770820302. The cubic root of 256918489 is about 635.7188948319.

The spelling of 256918489 in words is "two hundred fifty-six million, nine hundred eighteen thousand, four hundred eighty-nine".