11111201011081 has 2 divisors, whose sum is σ = 11111201011082. Its totient is φ = 11111201011080.

The previous prime is 11111201011051. The next prime is 11111201011187. The reversal of 11111201011081 is 18011010211111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9296913239056 + 1814287772025 = 3049084^2 + 1346955^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111201011081 - 2³³ = 11102611076489 is a prime.

It is a super-3 number, since 3×11111201011081³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (11111201011051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555600505540 + 5555600505541.

It is an arithmetic number, because the mean of its divisors is an integer number (5555600505541).

Almost surely, 2^{11111201011081} is an apocalyptic number.

It is an amenable number.

11111201011081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111201011081 is an equidigital number, since it uses as much as digits as its factorization.

11111201011081 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 19.

Adding to 11111201011081 its reverse (18011010211111), we get a palindrome (29122211222192).

The spelling of 11111201011081 in words is "eleven trillion, one hundred eleven billion, two hundred one million, eleven thousand, eighty-one".