2256689 has 2 divisors, whose sum is σ = 2256690. Its totient is φ = 2256688.

The previous prime is 2256677. The next prime is 2256697. The reversal of 2256689 is 9866522.

2256689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2226064 + 30625 = 1492^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256689 - 2⁴ = 2256673 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (2256619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128344 + 1128345.

It is an arithmetic number, because the mean of its divisors is an integer number (1128345).

2^2256689 is an apocalyptic number.

It is an amenable number.

2256689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256689 is an equidigital number, since it uses as much as digits as its factorization.

2256689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 2256689 is about 1502.2280119875. The cubic root of 2256689 is about 131.1667941260.

The spelling of 2256689 in words is "two million, two hundred fifty-six thousand, six hundred eighty-nine".