844990121 has 2 divisors, whose sum is σ = 844990122. Its totient is φ = 844990120.

The previous prime is 844990057. The next prime is 844990129. The reversal of 844990121 is 121099448.

844990121 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., 752734096 + 92256025 = 27436^2 + 9605^2 .

It is a cyclic number.

It is not a de Polignac number, because 844990121 - 2⁶ = 844990057 is a prime.

It is not a weakly prime, because it can be changed into another prime (844990129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422495060 + 422495061.

It is an arithmetic number, because the mean of its divisors is an integer number (422495061).

Almost surely, 2^844990121 is an apocalyptic number.

It is an amenable number.

844990121 is a deficient number, since it is larger than the sum of its proper divisors (1).

844990121 is an equidigital number, since it uses as much as digits as its factorization.

844990121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 844990121 is about 29068.7137830348. The cubic root of 844990121 is about 945.4035102929.

The spelling of 844990121 in words is "eight hundred forty-four million, nine hundred ninety thousand, one hundred twenty-one".