256443241 has 2 divisors, whose sum is σ = 256443242. Its totient is φ = 256443240.

The previous prime is 256443227. The next prime is 256443287. The reversal of 256443241 is 142344652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213160000 + 43283241 = 14600^2 + 6579^2 .

It is a cyclic number.

It is not a de Polignac number, because 256443241 - 2²⁷ = 122225513 is a prime.

It is not a weakly prime, because it can be changed into another prime (256443221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128221620 + 128221621.

It is an arithmetic number, because the mean of its divisors is an integer number (128221621).

Almost surely, 2^256443241 is an apocalyptic number.

It is an amenable number.

256443241 is a deficient number, since it is larger than the sum of its proper divisors (1).

256443241 is an equidigital number, since it uses as much as digits as its factorization.

256443241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 31.

The square root of 256443241 is about 16013.8452908725. The cubic root of 256443241 is about 635.3266684673.

Adding to 256443241 its reverse (142344652), we get a palindrome (398787893).

The spelling of 256443241 in words is "two hundred fifty-six million, four hundred forty-three thousand, two hundred forty-one".