11684509 has 2 divisors, whose sum is σ = 11684510. Its totient is φ = 11684508.

The previous prime is 11684503. The next prime is 11684513. The reversal of 11684509 is 90548611.

11684509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10582009 + 1102500 = 3253^2 + 1050^2 .

It is an emirp because it is prime and its reverse (90548611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11684509 - 2³ = 11684501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11684501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5842254 + 5842255.

It is an arithmetic number, because the mean of its divisors is an integer number (5842255).

Almost surely, 2^11684509 is an apocalyptic number.

It is an amenable number.

11684509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11684509 is an equidigital number, since it uses as much as digits as its factorization.

11684509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 11684509 is about 3418.2611076394. The cubic root of 11684509 is about 226.9186315263.

The spelling of 11684509 in words is "eleven million, six hundred eighty-four thousand, five hundred nine".