2256209 has 4 divisors (see below), whose sum is σ = 2261604. Its totient is φ = 2250816.

The previous prime is 2256197. The next prime is 2256217. The reversal of 2256209 is 9026522.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1507984 + 748225 = 1228^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256209 - 2¹² = 2252113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256259) 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, 2012 + ... + 2925.

It is an arithmetic number, because the mean of its divisors is an integer number (565401).

2^2256209 is an apocalyptic number.

It is an amenable number.

2256209 is a deficient number, since it is larger than the sum of its proper divisors (5395).

2256209 is an equidigital number, since it uses as much as digits as its factorization.

2256209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2256209 is about 1502.0682407933. The cubic root of 2256209 is about 131.1574936973.

The spelling of 2256209 in words is "two million, two hundred fifty-six thousand, two hundred nine".