11533989 has 4 divisors (see below), whose sum is σ = 15378656. Its totient is φ = 7689324.

The previous prime is 11533987. The next prime is 11533993. The reversal of 11533989 is 98933511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11533989 - 2¹ = 11533987 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11533981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1922329 + ... + 1922334.

It is an arithmetic number, because the mean of its divisors is an integer number (3844664).

Almost surely, 2^11533989 is an apocalyptic number.

It is an amenable number.

11533989 is a deficient number, since it is larger than the sum of its proper divisors (3844667).

11533989 is an equidigital number, since it uses as much as digits as its factorization.

11533989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844666.

The product of its digits is 29160, while the sum is 39.

The square root of 11533989 is about 3396.1726987890. The cubic root of 11533989 is about 225.9400276821.

The spelling of 11533989 in words is "eleven million, five hundred thirty-three thousand, nine hundred eighty-nine".