11811936509 has 2 divisors, whose sum is σ = 11811936510. Its totient is φ = 11811936508.

The previous prime is 11811936503. The next prime is 11811936527. The reversal of 11811936509 is 90563911811.

11811936509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11362920409 + 449016100 = 106597^2 + 21190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11811936509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11811936509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11811936503) 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 as a sum of consecutive naturals, namely, 5905968254 + 5905968255.

It is an arithmetic number, because the mean of its divisors is an integer number (5905968255).

Almost surely, 2^11811936509 is an apocalyptic number.

It is an amenable number.

11811936509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811936509 is an equidigital number, since it uses as much as digits as its factorization.

11811936509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 44.

The spelling of 11811936509 in words is "eleven billion, eight hundred eleven million, nine hundred thirty-six thousand, five hundred nine".