11989559 has 4 divisors (see below), whose sum is σ = 12244704. Its totient is φ = 11734416.

The previous prime is 11989553. The next prime is 11989597. The reversal of 11989559 is 95598911.

11989559 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11989559 - 2⁴ = 11989543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 255097 = 11989559 / (1 + 1 + 9 + 8 + 9 + 5 + 5 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127502 + ... + 127595.

It is an arithmetic number, because the mean of its divisors is an integer number (3061176).

Almost surely, 2^11989559 is an apocalyptic number.

11989559 is a deficient number, since it is larger than the sum of its proper divisors (255145).

11989559 is an equidigital number, since it uses as much as digits as its factorization.

11989559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255144.

The product of its digits is 145800, while the sum is 47.

The square root of 11989559 is about 3462.5942586448. The cubic root of 11989559 is about 228.8764294580.

The spelling of 11989559 in words is "eleven million, nine hundred eighty-nine thousand, five hundred fifty-nine".