1166015909 has 2 divisors, whose sum is σ = 1166015910. Its totient is φ = 1166015908.

The previous prime is 1166015897. The next prime is 1166015911. The reversal of 1166015909 is 9095106611.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1154980225 + 11035684 = 33985^2 + 3322^2 .

It is an emirp because it is prime and its reverse (9095106611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1166015909 - 2¹² = 1166011813 is a prime.

Together with 1166015911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166015969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583007954 + 583007955.

It is an arithmetic number, because the mean of its divisors is an integer number (583007955).

Almost surely, 2^1166015909 is an apocalyptic number.

It is an amenable number.

1166015909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166015909 is an equidigital number, since it uses as much as digits as its factorization.

1166015909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 1166015909 is about 34146.9751076139. The cubic root of 1166015909 is about 1052.5308289464.

The spelling of 1166015909 in words is "one billion, one hundred sixty-six million, fifteen thousand, nine hundred nine".