11881541209 has 2 divisors, whose sum is σ = 11881541210. Its totient is φ = 11881541208.

The previous prime is 11881541183. The next prime is 11881541239. The reversal of 11881541209 is 90214518811.

11881541209 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., 10265742400 + 1615798809 = 101320^2 + 40197^2 .

It is a cyclic number.

It is not a de Polignac number, because 11881541209 - 2¹⁹ = 11881016921 is a prime.

It is not a weakly prime, because it can be changed into another prime (11881541239) 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, 5940770604 + 5940770605.

It is an arithmetic number, because the mean of its divisors is an integer number (5940770605).

Almost surely, 2^11881541209 is an apocalyptic number.

It is an amenable number.

11881541209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11881541209 is an equidigital number, since it uses as much as digits as its factorization.

11881541209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 40.

The spelling of 11881541209 in words is "eleven billion, eight hundred eighty-one million, five hundred forty-one thousand, two hundred nine".