4444009981 has 2 divisors, whose sum is σ = 4444009982. Its totient is φ = 4444009980.

The previous prime is 4444009979. The next prime is 4444010009. The reversal of 4444009981 is 1899004444.

It is a happy number.

4444009981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3920012100 + 523997881 = 62610^2 + 22891^2 .

It is a cyclic number.

It is not a de Polignac number, because 4444009981 - 2¹ = 4444009979 is a prime.

It is a super-2 number, since 2×4444009981² = 39498449422455240722, which contains 22 as substring.

Together with 4444009979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4444009481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2222004990 + 2222004991.

It is an arithmetic number, because the mean of its divisors is an integer number (2222004991).

Almost surely, 2^4444009981 is an apocalyptic number.

It is an amenable number.

4444009981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4444009981 is an equidigital number, since it uses as much as digits as its factorization.

4444009981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 4444009981 is about 66663.4081111970. The cubic root of 4444009981 is about 1644.0878071916.

The spelling of 4444009981 in words is "four billion, four hundred forty-four million, nine thousand, nine hundred eighty-one".