11011011991909 has 2 divisors, whose sum is σ = 11011011991910. Its totient is φ = 11011011991908.

The previous prime is 11011011991897. The next prime is 11011011991933. The reversal of 11011011991909 is 90919911011011.

It is a happy number.

11011011991909 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., 9580170184225 + 1430841807684 = 3095185^2 + 1196178^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011011991909 - 2¹⁵ = 11011011959141 is a prime.

It is a super-3 number, since 3×11011011991909³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011011991939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505505995954 + 5505505995955.

It is an arithmetic number, because the mean of its divisors is an integer number (5505505995955).

Almost surely, 2^{11011011991909} is an apocalyptic number.

It is an amenable number.

11011011991909 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011011991909 is an equidigital number, since it uses as much as digits as its factorization.

11011011991909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 43.

The spelling of 11011011991909 in words is "eleven trillion, eleven billion, eleven million, nine hundred ninety-one thousand, nine hundred nine".