256165211 has 4 divisors (see below), whose sum is σ = 256275624. Its totient is φ = 256054800.

The previous prime is 256165199. The next prime is 256165241. The reversal of 256165211 is 112561652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256165211 - 2²² = 251970907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256165241) 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, 51650 + ... + 56391.

It is an arithmetic number, because the mean of its divisors is an integer number (64068906).

Almost surely, 2^256165211 is an apocalyptic number.

256165211 is a deficient number, since it is larger than the sum of its proper divisors (110413).

256165211 is a wasteful number, since it uses less digits than its factorization.

256165211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110412.

The product of its digits is 3600, while the sum is 29.

The square root of 256165211 is about 16005.1620110513. The cubic root of 256165211 is about 635.0969831411.

The spelling of 256165211 in words is "two hundred fifty-six million, one hundred sixty-five thousand, two hundred eleven".