11656559 has 2 divisors, whose sum is σ = 11656560. Its totient is φ = 11656558.

The previous prime is 11656553. The next prime is 11656573. The reversal of 11656559 is 95565611.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11656559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11656553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5828279 + 5828280.

It is an arithmetic number, because the mean of its divisors is an integer number (5828280).

Almost surely, 2^11656559 is an apocalyptic number.

11656559 is a deficient number, since it is larger than the sum of its proper divisors (1).

11656559 is an equidigital number, since it uses as much as digits as its factorization.

11656559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 38.

The square root of 11656559 is about 3414.1703238122. The cubic root of 11656559 is about 226.7375530406.

The spelling of 11656559 in words is "eleven million, six hundred fifty-six thousand, five hundred fifty-nine".