2311109981 has 2 divisors, whose sum is σ = 2311109982. Its totient is φ = 2311109980.

The previous prime is 2311109921. The next prime is 2311110019. The reversal of 2311109981 is 1899011132.

2311109981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1963287481 + 347822500 = 44309^2 + 18650^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311109981 - 2²⁶ = 2244001117 is a prime.

It is a super-2 number, since 2×2311109981² = 10682458688555640722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2311109921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155554990 + 1155554991.

It is an arithmetic number, because the mean of its divisors is an integer number (1155554991).

Almost surely, 2^2311109981 is an apocalyptic number.

It is an amenable number.

2311109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311109981 is an equidigital number, since it uses as much as digits as its factorization.

2311109981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 2311109981 is about 48074.0052523191. The cubic root of 2311109981 is about 1322.1281062845.

The spelling of 2311109981 in words is "two billion, three hundred eleven million, one hundred nine thousand, nine hundred eighty-one".