111001001081 has 2 divisors, whose sum is σ = 111001001082. Its totient is φ = 111001001080.

The previous prime is 111001001057. The next prime is 111001001117. The reversal of 111001001081 is 180100100111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68445024400 + 42555976681 = 261620^2 + 206291^2 .

It is a cyclic number.

It is not a de Polignac number, because 111001001081 - 2³⁰ = 109927259257 is a prime.

It is a super-2 number, since 2×111001001081² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (111001001021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500500540 + 55500500541.

It is an arithmetic number, because the mean of its divisors is an integer number (55500500541).

Almost surely, 2^111001001081 is an apocalyptic number.

It is an amenable number.

111001001081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111001001081 is an equidigital number, since it uses as much as digits as its factorization.

111001001081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111001001081 its reverse (180100100111), we get a palindrome (291101101192).

The spelling of 111001001081 in words is "one hundred eleven billion, one million, one thousand, eighty-one".