11915009 has 2 divisors, whose sum is σ = 11915010. Its totient is φ = 11915008.

The previous prime is 11914993. The next prime is 11915023. The reversal of 11915009 is 90051911.

It is a happy number.

11915009 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., 11242609 + 672400 = 3353^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 11915009 - 2⁴ = 11914993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11915609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5957504 + 5957505.

It is an arithmetic number, because the mean of its divisors is an integer number (5957505).

Almost surely, 2^11915009 is an apocalyptic number.

It is an amenable number.

11915009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11915009 is an equidigital number, since it uses as much as digits as its factorization.

11915009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 11915009 is about 3451.8124224818. The cubic root of 11915009 is about 228.4010651474.

The spelling of 11915009 in words is "eleven million, nine hundred fifteen thousand, nine".