11687909 has 2 divisors, whose sum is σ = 11687910. Its totient is φ = 11687908.

The previous prime is 11687903. The next prime is 11687917. The reversal of 11687909 is 90978611.

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., 10543009 + 1144900 = 3247^2 + 1070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11687909 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11687903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5843954 + 5843955.

It is an arithmetic number, because the mean of its divisors is an integer number (5843955).

Almost surely, 2^11687909 is an apocalyptic number.

It is an amenable number.

11687909 is a deficient number, since it is larger than the sum of its proper divisors (1).

11687909 is an equidigital number, since it uses as much as digits as its factorization.

11687909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 11687909 is about 3418.7584003553. The cubic root of 11687909 is about 226.9406392554.

The spelling of 11687909 in words is "eleven million, six hundred eighty-seven thousand, nine hundred nine".