256565201 has 4 divisors (see below), whose sum is σ = 259656432. Its totient is φ = 253473972.

The previous prime is 256565191. The next prime is 256565237. The reversal of 256565201 is 102565652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256565201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256565251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1545491 + ... + 1545656.

It is an arithmetic number, because the mean of its divisors is an integer number (64914108).

Almost surely, 2^256565201 is an apocalyptic number.

It is an amenable number.

256565201 is a deficient number, since it is larger than the sum of its proper divisors (3091231).

256565201 is an equidigital number, since it uses as much as digits as its factorization.

256565201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091230.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 256565201 is about 16017.6527930905. The cubic root of 256565201 is about 635.4273693216.

The spelling of 256565201 in words is "two hundred fifty-six million, five hundred sixty-five thousand, two hundred one".