256275689 has 2 divisors, whose sum is σ = 256275690. Its totient is φ = 256275688.

The previous prime is 256275671. The next prime is 256275779. The reversal of 256275689 is 986572652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156675289 + 99600400 = 12517^2 + 9980^2 .

It is a cyclic number.

It is not a de Polignac number, because 256275689 - 2¹² = 256271593 is a prime.

It is not a weakly prime, because it can be changed into another prime (256275389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128137844 + 128137845.

It is an arithmetic number, because the mean of its divisors is an integer number (128137845).

Almost surely, 2^256275689 is an apocalyptic number.

It is an amenable number.

256275689 is a deficient number, since it is larger than the sum of its proper divisors (1).

256275689 is an equidigital number, since it uses as much as digits as its factorization.

256275689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 50.

The square root of 256275689 is about 16008.6129630271. The cubic root of 256275689 is about 635.1882707908.

The spelling of 256275689 in words is "two hundred fifty-six million, two hundred seventy-five thousand, six hundred eighty-nine".