1110018181981 has 2 divisors, whose sum is σ = 1110018181982. Its totient is φ = 1110018181980.

The previous prime is 1110018181949. The next prime is 1110018182029. The reversal of 1110018181981 is 1891818100111.

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., 947830756356 + 162187425625 = 973566^2 + 402725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1110018181981 - 2⁵ = 1110018181949 is a prime.

It is a super-2 number, since 2×1110018181981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1110018184981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555009090990 + 555009090991.

It is an arithmetic number, because the mean of its divisors is an integer number (555009090991).

Almost surely, 2^{1110018181981} is an apocalyptic number.

It is an amenable number.

1110018181981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1110018181981 is an equidigital number, since it uses as much as digits as its factorization.

1110018181981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 40.

The spelling of 1110018181981 in words is "one trillion, one hundred ten billion, eighteen million, one hundred eighty-one thousand, nine hundred eighty-one".