11936218009 has 3 divisors (see below), whose sum is σ = 11936327263. Its totient is φ = 11936108756.

The previous prime is 11936218003. The next prime is 11936218039. The reversal of 11936218009 is 90081263911.

The square root of 11936218009 is 109253.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4672406025 + 7263811984 = 68355^2 + 85228^2 .

It is not a de Polignac number, because 11936218009 - 2²³ = 11927829401 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11936218003) 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 2 ways as a sum of consecutive naturals, for example, 54627 + ... + 163879.

Almost surely, 2^11936218009 is an apocalyptic number.

11936218009 is the 109253-rd square number.

11936218009 is the 54627-th centered octagonal number.

It is an amenable number.

11936218009 is a deficient number, since it is larger than the sum of its proper divisors (109254).

11936218009 is an frugal number, since it uses more digits than its factorization.

11936218009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218506 (or 109253 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 11936218009 in words is "eleven billion, nine hundred thirty-six million, two hundred eighteen thousand, nine".