111611081 has 2 divisors, whose sum is σ = 111611082. Its totient is φ = 111611080.

The previous prime is 111611063. The next prime is 111611099. The reversal of 111611081 is 180116111.

It is a balanced prime because it is at equal distance from previous prime (111611063) and next prime (111611099).

It can be written as a sum of positive squares in only one way, i.e., 91853056 + 19758025 = 9584^2 + 4445^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 180119111 and 111911081.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111611081 is a prime.

It is a super-3 number, since 3×111611081³ (a number of 25 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 (111611051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55805540 + 55805541.

It is an arithmetic number, because the mean of its divisors is an integer number (55805541).

Almost surely, 2^111611081 is an apocalyptic number.

It is an amenable number.

111611081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111611081 is an equidigital number, since it uses as much as digits as its factorization.

111611081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 20.

The square root of 111611081 is about 10564.6145694010. The cubic root of 111611081 is about 481.4698592653.

Adding to 111611081 its reverse (180116111), we get a palindrome (291727192).

The spelling of 111611081 in words is "one hundred eleven million, six hundred eleven thousand, eighty-one".