2000109109981 has 2 divisors, whose sum is σ = 2000109109982. Its totient is φ = 2000109109980.

The previous prime is 2000109109949. The next prime is 2000109110009. The reversal of 2000109109981 is 1899019010002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1536940390756 + 463168719225 = 1239734^2 + 680565^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000109109981 - 2⁵ = 2000109109949 is a prime.

It is a super-2 number, since 2×2000109109981² (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 (2000109107981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000054554990 + 1000054554991.

It is an arithmetic number, because the mean of its divisors is an integer number (1000054554991).

Almost surely, 2^{2000109109981} is an apocalyptic number.

It is an amenable number.

2000109109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000109109981 is an equidigital number, since it uses as much as digits as its factorization.

2000109109981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 2000109109981 in words is "two trillion, one hundred nine million, one hundred nine thousand, nine hundred eighty-one".