2235809 has 2 divisors, whose sum is σ = 2235810. Its totient is φ = 2235808.

The previous prime is 2235803. The next prime is 2235811. The reversal of 2235809 is 9085322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2235025 + 784 = 1495^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 2235809 - 2⁸ = 2235553 is a prime.

It is a Sophie Germain prime.

Together with 2235811, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2⁶ + 2¹⁸ + 3⁹ + 5⁹ + 8² + 0 + 9³ .

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2235803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1117904 + 1117905.

It is an arithmetic number, because the mean of its divisors is an integer number (1117905).

2^2235809 is an apocalyptic number.

It is an amenable number.

2235809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2235809 is an equidigital number, since it uses as much as digits as its factorization.

2235809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 2235809 is about 1495.2621843677. The cubic root of 2235809 is about 130.7610000409.

The spelling of 2235809 in words is "two million, two hundred thirty-five thousand, eight hundred nine".