11509642089 has 27 divisors (see below), whose sum is σ = 18279425437. Its totient is φ = 6973395000.

The previous prime is 11509642013. The next prime is 11509642097. The reversal of 11509642089 is 98024690511.

The square root of 11509642089 is 107283.

It is a perfect power (a square), and thus also a powerful number.

11509642089 is a `hidden beast` number, since 1 + 1 + 509 + 64 + 2 + 0 + 89 = 666.

11509642089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11509642089 - 2¹⁹ = 11509117801 is a prime.

It is a super-2 number, since 2×11509642089² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11509642189) 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 26 ways as a sum of consecutive naturals, for example, 3538714 + ... + 3541964.

Almost surely, 2^11509642089 is an apocalyptic number.

11509642089 is the 107283-rd square number.

11509642089 is the 53642-nd centered octagonal number.

It is an amenable number.

11509642089 is a deficient number, since it is larger than the sum of its proper divisors (6769783348).

11509642089 is an frugal number, since it uses more digits than its factorization.

11509642089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6530 (or 3265 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 11509642089 in words is "eleven billion, five hundred nine million, six hundred forty-two thousand, eighty-nine".