11643559 has 2 divisors, whose sum is σ = 11643560. Its totient is φ = 11643558.

The previous prime is 11643557. The next prime is 11643563. The reversal of 11643559 is 95534611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11643559 - 2¹ = 11643557 is a prime.

Together with 11643557, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11643557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5821779 + 5821780.

It is an arithmetic number, because the mean of its divisors is an integer number (5821780).

Almost surely, 2^11643559 is an apocalyptic number.

11643559 is a deficient number, since it is larger than the sum of its proper divisors (1).

11643559 is an equidigital number, since it uses as much as digits as its factorization.

11643559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The square root of 11643559 is about 3412.2659626706. The cubic root of 11643559 is about 226.6532318546.

The spelling of 11643559 in words is "eleven million, six hundred forty-three thousand, five hundred fifty-nine".