111110101010081 has 2 divisors, whose sum is σ = 111110101010082. Its totient is φ = 111110101010080.

The previous prime is 111110101010071. The next prime is 111110101010147. The reversal of 111110101010081 is 180010101011111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80693552395681 + 30416548614400 = 8982959^2 + 5515120^2 .

It is a cyclic number.

It is not a de Polignac number, because 111110101010081 - 2¹⁸ = 111110100747937 is a prime.

It is a super-2 number, since 2×111110101010081² (a number of 29 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 (111110101010071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555050505040 + 55555050505041.

It is an arithmetic number, because the mean of its divisors is an integer number (55555050505041).

Almost surely, 2^{111110101010081} is an apocalyptic number.

It is an amenable number.

111110101010081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111110101010081 is an equidigital number, since it uses as much as digits as its factorization.

111110101010081 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 17.

Adding to 111110101010081 its reverse (180010101011111), we get a palindrome (291120202021192).

The spelling of 111110101010081 in words is "one hundred eleven trillion, one hundred ten billion, one hundred one million, ten thousand, eighty-one".