2255809 has 4 divisors (see below), whose sum is σ = 2258820. Its totient is φ = 2252800.

The previous prime is 2255797. The next prime is 2255821. The reversal of 2255809 is 9085522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9085522 = 2 ⋅4542761.

It is an interprime number because it is at equal distance from previous prime (2255797) and next prime (2255821).

It can be written as a sum of positive squares in 2 ways, for example, as 1199025 + 1056784 = 1095^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 2255809 - 2⁷ = 2255681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2255899) 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, 609 + ... + 2209.

It is an arithmetic number, because the mean of its divisors is an integer number (564705).

2^2255809 is an apocalyptic number.

It is an amenable number.

2255809 is a deficient number, since it is larger than the sum of its proper divisors (3011).

2255809 is a wasteful number, since it uses less digits than its factorization.

2255809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 2255809 is about 1501.9350851485. The cubic root of 2255809 is about 131.1497423323.

The spelling of 2255809 in words is "two million, two hundred fifty-five thousand, eight hundred nine".