11487809 has 2 divisors, whose sum is σ = 11487810. Its totient is φ = 11487808.

The previous prime is 11487793. The next prime is 11487811. The reversal of 11487809 is 90878411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11458225 + 29584 = 3385^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 11487809 - 2⁴ = 11487793 is a prime.

Together with 11487811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11487829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5743904 + 5743905.

It is an arithmetic number, because the mean of its divisors is an integer number (5743905).

Almost surely, 2^11487809 is an apocalyptic number.

It is an amenable number.

11487809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11487809 is an equidigital number, since it uses as much as digits as its factorization.

11487809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 11487809 is about 3389.3670500552. The cubic root of 11487809 is about 225.6380833823.

The spelling of 11487809 in words is "eleven million, four hundred eighty-seven thousand, eight hundred nine".