256400201 has 2 divisors, whose sum is σ = 256400202. Its totient is φ = 256400200.

The previous prime is 256400191. The next prime is 256400257. The reversal of 256400201 is 102004652.

It is a happy number.

256400201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 240994576 + 15405625 = 15524^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 256400201 - 2²⁶ = 189291337 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (256400401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128200100 + 128200101.

It is an arithmetic number, because the mean of its divisors is an integer number (128200101).

Almost surely, 2^256400201 is an apocalyptic number.

It is an amenable number.

256400201 is a deficient number, since it is larger than the sum of its proper divisors (1).

256400201 is an equidigital number, since it uses as much as digits as its factorization.

256400201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 256400201 is about 16012.5013973458. The cubic root of 256400201 is about 635.2911232532.

Adding to 256400201 its reverse (102004652), we get a palindrome (358404853).

The spelling of 256400201 in words is "two hundred fifty-six million, four hundred thousand, two hundred one".