256635201 has 16 divisors (see below), whose sum is σ = 344736000. Its totient is φ = 169818000.

The previous prime is 256635199. The next prime is 256635217. The reversal of 256635201 is 102536652.

It is not a de Polignac number, because 256635201 - 2¹ = 256635199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256635271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375406 + ... + 376088.

It is an arithmetic number, because the mean of its divisors is an integer number (21546000).

Almost surely, 2^256635201 is an apocalyptic number.

It is an amenable number.

256635201 is a deficient number, since it is larger than the sum of its proper divisors (88100799).

256635201 is a wasteful number, since it uses less digits than its factorization.

256635201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 256635201 is about 16019.8377332606. The cubic root of 256635201 is about 635.4851530364.

The spelling of 256635201 in words is "two hundred fifty-six million, six hundred thirty-five thousand, two hundred one".