111112081 has 2 divisors, whose sum is σ = 111112082. Its totient is φ = 111112080.

The previous prime is 111112039. The next prime is 111112087. The reversal of 111112081 is 180211111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106090000 + 5022081 = 10300^2 + 2241^2 .

It is an emirp because it is prime and its reverse (180211111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111112081 - 2⁷ = 111111953 is a prime.

It is a super-2 number, since 2×111112081² = 24691789088301122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111112087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55556040 + 55556041.

It is an arithmetic number, because the mean of its divisors is an integer number (55556041).

Almost surely, 2^111112081 is an apocalyptic number.

It is an amenable number.

111112081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111112081 is an equidigital number, since it uses as much as digits as its factorization.

111112081 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 16.

The square root of 111112081 is about 10540.9715396637. The cubic root of 111112081 is about 480.7512555869.

Adding to 111112081 its reverse (180211111), we get a palindrome (291323192).

The spelling of 111112081 in words is "one hundred eleven million, one hundred twelve thousand, eighty-one".