11921589 has 6 divisors (see below), whose sum is σ = 17220086. Its totient is φ = 7947720.

The previous prime is 11921587. The next prime is 11921593. The reversal of 11921589 is 98512911.

It can be written as a sum of positive squares in only one way, i.e., 9199089 + 2722500 = 3033^2 + 1650^2 .

It is not a de Polignac number, because 11921589 - 2¹ = 11921587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921587) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 662302 + ... + 662319.

Almost surely, 2^11921589 is an apocalyptic number.

It is an amenable number.

11921589 is a deficient number, since it is larger than the sum of its proper divisors (5298497).

11921589 is a wasteful number, since it uses less digits than its factorization.

11921589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324627 (or 1324624 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 11921589 is about 3452.7654134042. The cubic root of 11921589 is about 228.4431018324.

It can be divided in two parts, 11 and 921589, that added together give a square (921600 = 960²).

The spelling of 11921589 in words is "eleven million, nine hundred twenty-one thousand, five hundred eighty-nine".