256663241 has 2 divisors, whose sum is σ = 256663242. Its totient is φ = 256663240.

The previous prime is 256663219. The next prime is 256663243. The reversal of 256663241 is 142366652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135024400 + 121638841 = 11620^2 + 11029^2 .

It is a cyclic number.

It is not a de Polignac number, because 256663241 - 2⁶ = 256663177 is a prime.

Together with 256663243, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256663243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128331620 + 128331621.

It is an arithmetic number, because the mean of its divisors is an integer number (128331621).

Almost surely, 2^256663241 is an apocalyptic number.

It is an amenable number.

256663241 is a deficient number, since it is larger than the sum of its proper divisors (1).

256663241 is an equidigital number, since it uses as much as digits as its factorization.

256663241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 256663241 is about 16020.7128742762. The cubic root of 256663241 is about 635.5082965942.

The spelling of 256663241 in words is "two hundred fifty-six million, six hundred sixty-three thousand, two hundred forty-one".