11550809 has 2 divisors, whose sum is σ = 11550810. Its totient is φ = 11550808.

The previous prime is 11550793. The next prime is 11550811. The reversal of 11550809 is 90805511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7997584 + 3553225 = 2828^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 11550809 - 2⁴ = 11550793 is a prime.

It is a Sophie Germain prime.

Together with 11550811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11550829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775404 + 5775405.

It is an arithmetic number, because the mean of its divisors is an integer number (5775405).

Almost surely, 2^11550809 is an apocalyptic number.

It is an amenable number.

11550809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11550809 is an equidigital number, since it uses as much as digits as its factorization.

11550809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 11550809 is about 3398.6481135887. The cubic root of 11550809 is about 226.0498036792.

The spelling of 11550809 in words is "eleven million, five hundred fifty thousand, eight hundred nine".