11011111011181 has 2 divisors, whose sum is σ = 11011111011182. Its totient is φ = 11011111011180.

The previous prime is 11011111011179. The next prime is 11011111011203. The reversal of 11011111011181 is 18111011111011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6566355000100 + 4444756011081 = 2562490^2 + 2108259^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011111011181 - 2¹ = 11011111011179 is a prime.

It is a super-2 number, since 2×11011111011181² (a number of 27 digits) contains 22 as substring.

Together with 11011111011179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011111011581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505555505590 + 5505555505591.

It is an arithmetic number, because the mean of its divisors is an integer number (5505555505591).

Almost surely, 2^{11011111011181} is an apocalyptic number.

It is an amenable number.

11011111011181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011111011181 is an equidigital number, since it uses as much as digits as its factorization.

11011111011181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 19.

Adding to 11011111011181 its reverse (18111011111011), we get a palindrome (29122122122192).

The spelling of 11011111011181 in words is "eleven trillion, eleven billion, one hundred eleven million, eleven thousand, one hundred eighty-one".