11566913 has 2 divisors, whose sum is σ = 11566914. Its totient is φ = 11566912.

The previous prime is 11566897. The next prime is 11566931. The reversal of 11566913 is 31966511.

It is a happy number.

11566913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (11566931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7907344 + 3659569 = 2812^2 + 1913^2 .

It is a cyclic number.

It is not a de Polignac number, because 11566913 - 2⁴ = 11566897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11566913.

It is not a weakly prime, because it can be changed into another prime (11566993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5783456 + 5783457.

It is an arithmetic number, because the mean of its divisors is an integer number (5783457).

Almost surely, 2^11566913 is an apocalyptic number.

It is an amenable number.

11566913 is a deficient number, since it is larger than the sum of its proper divisors (1).

11566913 is an equidigital number, since it uses as much as digits as its factorization.

11566913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 32.

The square root of 11566913 is about 3401.0164657055. The cubic root of 11566913 is about 226.1548068754.

The spelling of 11566913 in words is "eleven million, five hundred sixty-six thousand, nine hundred thirteen".