2256781209 has 8 divisors (see below), whose sum is σ = 3009397152. Its totient is φ = 1504343040.

The previous prime is 2256781207. The next prime is 2256781213. The reversal of 2256781209 is 9021876522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2256781209 - 2¹ = 2256781207 is a prime.

It is a super-2 number, since 2×2256781209² = 10186122850591003362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2256781207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11287 + ... + 68124.

It is an arithmetic number, because the mean of its divisors is an integer number (376174644).

Almost surely, 2^2256781209 is an apocalyptic number.

It is an amenable number.

2256781209 is a deficient number, since it is larger than the sum of its proper divisors (752615943).

2256781209 is an equidigital number, since it uses as much as digits as its factorization.

2256781209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88887.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 2256781209 is about 47505.5913445986. The cubic root of 2256781209 is about 1311.6858060674.

The spelling of 2256781209 in words is "two billion, two hundred fifty-six million, seven hundred eighty-one thousand, two hundred nine".