11111120011181 has 2 divisors, whose sum is σ = 11111120011182. Its totient is φ = 11111120011180.

The previous prime is 11111120011163. The next prime is 11111120011213. The reversal of 11111120011181 is 18111002111111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10813140495556 + 297979515625 = 3288334^2 + 545875^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111120011181 - 2²⁶ = 11111052902317 is a prime.

It is a super-2 number, since 2×11111120011181² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111120011081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555560005590 + 5555560005591.

It is an arithmetic number, because the mean of its divisors is an integer number (5555560005591).

Almost surely, 2^{11111120011181} is an apocalyptic number.

It is an amenable number.

11111120011181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111120011181 is an equidigital number, since it uses as much as digits as its factorization.

11111120011181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 20.

Adding to 11111120011181 its reverse (18111002111111), we get a palindrome (29222122122292).

The spelling of 11111120011181 in words is "eleven trillion, one hundred eleven billion, one hundred twenty million, eleven thousand, one hundred eighty-one".