256433249 has 2 divisors, whose sum is σ = 256433250. Its totient is φ = 256433248.

The previous prime is 256433237. The next prime is 256433257. The reversal of 256433249 is 942334652.

256433249 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., 181090849 + 75342400 = 13457^2 + 8680^2 .

It is a cyclic number.

It is not a de Polignac number, because 256433249 - 2²⁰ = 255384673 is a prime.

It is a super-2 number, since 2×256433249² = 131516022385392002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256433299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128216624 + 128216625.

It is an arithmetic number, because the mean of its divisors is an integer number (128216625).

Almost surely, 2^256433249 is an apocalyptic number.

It is an amenable number.

256433249 is a deficient number, since it is larger than the sum of its proper divisors (1).

256433249 is an equidigital number, since it uses as much as digits as its factorization.

256433249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 38.

The square root of 256433249 is about 16013.5333077994. The cubic root of 256433249 is about 635.3184167824.

The spelling of 256433249 in words is "two hundred fifty-six million, four hundred thirty-three thousand, two hundred forty-nine".