111000001081 has 2 divisors, whose sum is σ = 111000001082. Its totient is φ = 111000001080.

The previous prime is 111000001043. The next prime is 111000001171. The reversal of 111000001081 is 180100000111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105716019600 + 5283981481 = 325140^2 + 72691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111000001081 is a prime.

It is a super-2 number, since 2×111000001081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111000001781) 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, 55500000540 + 55500000541.

It is an arithmetic number, because the mean of its divisors is an integer number (55500000541).

Almost surely, 2^111000001081 is an apocalyptic number.

It is an amenable number.

111000001081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111000001081 is an equidigital number, since it uses as much as digits as its factorization.

111000001081 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 13.

Adding to 111000001081 its reverse (180100000111), we get a palindrome (291100001192).

The spelling of 111000001081 in words is "one hundred eleven billion, one thousand, eighty-one".