11818559 has 2 divisors, whose sum is σ = 11818560. Its totient is φ = 11818558.

The previous prime is 11818549. The next prime is 11818561. The reversal of 11818559 is 95581811.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11818559 is a prime.

Together with 11818561, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₇₇₆₉₁₈ and since 11818559 and 776918 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11818549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5909279 + 5909280.

It is an arithmetic number, because the mean of its divisors is an integer number (5909280).

Almost surely, 2^11818559 is an apocalyptic number.

11818559 is a deficient number, since it is larger than the sum of its proper divisors (1).

11818559 is an equidigital number, since it uses as much as digits as its factorization.

11818559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 38.

The square root of 11818559 is about 3437.8131130124. The cubic root of 11818559 is about 227.7831052668.

The spelling of 11818559 in words is "eleven million, eight hundred eighteen thousand, five hundred fifty-nine".