11866009 has 2 divisors, whose sum is σ = 11866010. Its totient is φ = 11866008.

The previous prime is 11865989. The next prime is 11866031. The reversal of 11866009 is 90066811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7683984 + 4182025 = 2772^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 11866009 - 2¹³ = 11857817 is a prime.

It is not a weakly prime, because it can be changed into another prime (11866039) 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 as a sum of consecutive naturals, namely, 5933004 + 5933005.

It is an arithmetic number, because the mean of its divisors is an integer number (5933005).

Almost surely, 2^11866009 is an apocalyptic number.

It is an amenable number.

11866009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11866009 is an equidigital number, since it uses as much as digits as its factorization.

11866009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 11866009 is about 3444.7073896051. The cubic root of 11866009 is about 228.0875382033.

The spelling of 11866009 in words is "eleven million, eight hundred sixty-six thousand, nine".