11599936209 has 21 divisors (see below), whose sum is σ = 17396309323. Its totient is φ = 7731352152.

The previous prime is 11599936207. The next prime is 11599936253. The reversal of 11599936209 is 90263999511.

The square root of 11599936209 is 107703.

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

11599936209 is a `hidden beast` number, since 1 + 1 + 5 + 9 + 9 + 9 + 3 + 620 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5469046209 + 6130890000 = 73953^2 + 78300^2 .

It is not a de Polignac number, because 11599936209 - 2¹ = 11599936207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11599936207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 2905987 + ... + 2909975.

Almost surely, 2^11599936209 is an apocalyptic number.

11599936209 is the 107703-rd square number.

11599936209 is the 53852-nd centered octagonal number.

It is an amenable number.

11599936209 is a deficient number, since it is larger than the sum of its proper divisors (5796373114).

11599936209 is an frugal number, since it uses more digits than its factorization.

11599936209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7996 (or 3992 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The spelling of 11599936209 in words is "eleven billion, five hundred ninety-nine million, nine hundred thirty-six thousand, two hundred nine".