11561689 has 2 divisors, whose sum is σ = 11561690. Its totient is φ = 11561688.

The previous prime is 11561687. The next prime is 11561707. The reversal of 11561689 is 98616511.

11561689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6086089 + 5475600 = 2467^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 11561689 - 2¹ = 11561687 is a prime.

Together with 11561687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11561681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5780844 + 5780845.

It is an arithmetic number, because the mean of its divisors is an integer number (5780845).

Almost surely, 2^11561689 is an apocalyptic number.

It is an amenable number.

11561689 is a deficient number, since it is larger than the sum of its proper divisors (1).

11561689 is an equidigital number, since it uses as much as digits as its factorization.

11561689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 37.

The square root of 11561689 is about 3400.2483732810. The cubic root of 11561689 is about 226.1207554215.

The spelling of 11561689 in words is "eleven million, five hundred sixty-one thousand, six hundred eighty-nine".