2256639859 has 4 divisors (see below), whose sum is σ = 2260161000. Its totient is φ = 2253118720.

The previous prime is 2256639829. The next prime is 2256639887. The reversal of 2256639859 is 9589366522.

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 2256639859 - 2¹³ = 2256631667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256639809) 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, 1759609 + ... + 1760890.

It is an arithmetic number, because the mean of its divisors is an integer number (565040250).

Almost surely, 2^2256639859 is an apocalyptic number.

2256639859 is a deficient number, since it is larger than the sum of its proper divisors (3521141).

2256639859 is an equidigital number, since it uses as much as digits as its factorization.

2256639859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521140.

The product of its digits is 6998400, while the sum is 55.

The square root of 2256639859 is about 47504.1036016890. The cubic root of 2256639859 is about 1311.6584203585.

The spelling of 2256639859 in words is "two billion, two hundred fifty-six million, six hundred thirty-nine thousand, eight hundred fifty-nine".