11661909 has 16 divisors (see below), whose sum is σ = 17820288. Its totient is φ = 6645312.

The previous prime is 11661907. The next prime is 11661911. The reversal of 11661909 is 90916611.

It is an interprime number because it is at equal distance from previous prime (11661907) and next prime (11661911).

It is not a de Polignac number, because 11661909 - 2¹ = 11661907 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11661909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11199 + ... + 12195.

It is an arithmetic number, because the mean of its divisors is an integer number (1113768).

Almost surely, 2^11661909 is an apocalyptic number.

It is an amenable number.

11661909 is a deficient number, since it is larger than the sum of its proper divisors (6158379).

11661909 is an equidigital number, since it uses as much as digits as its factorization.

11661909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 11661909 is about 3414.9537332151. The cubic root of 11661909 is about 226.7722362426.

The spelling of 11661909 in words is "eleven million, six hundred sixty-one thousand, nine hundred nine".