844009009 has 2 divisors, whose sum is σ = 844009010. Its totient is φ = 844009008.

The previous prime is 844009003. The next prime is 844009043. The reversal of 844009009 is 900900448.

It is an a-pointer prime, because the next prime (844009043) can be obtained adding 844009009 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723448609 + 120560400 = 26897^2 + 10980^2 .

It is a cyclic number.

It is not a de Polignac number, because 844009009 - 2⁷ = 844008881 is a prime.

844009009 is a modest number, since divided by 9009 gives 844 as remainder.

It is not a weakly prime, because it can be changed into another prime (844009003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422004504 + 422004505.

It is an arithmetic number, because the mean of its divisors is an integer number (422004505).

Almost surely, 2^844009009 is an apocalyptic number.

It is an amenable number.

844009009 is a deficient number, since it is larger than the sum of its proper divisors (1).

844009009 is an equidigital number, since it uses as much as digits as its factorization.

844009009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 844009009 is about 29051.8331435385. The cubic root of 844009009 is about 945.0374681635.

The spelling of 844009009 in words is "eight hundred forty-four million, nine thousand, nine".