844990129 has 2 divisors, whose sum is σ = 844990130. Its totient is φ = 844990128.

The previous prime is 844990121. The next prime is 844990163. The reversal of 844990129 is 921099448.

844990129 is digitally balanced in base 2, 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., 600005025 + 244985104 = 24495^2 + 15652^2 .

It is a cyclic number.

It is not a de Polignac number, because 844990129 - 2³ = 844990121 is a prime.

It is not a weakly prime, because it can be changed into another prime (844990121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422495064 + 422495065.

It is an arithmetic number, because the mean of its divisors is an integer number (422495065).

Almost surely, 2^844990129 is an apocalyptic number.

It is an amenable number.

844990129 is a deficient number, since it is larger than the sum of its proper divisors (1).

844990129 is an equidigital number, since it uses as much as digits as its factorization.

844990129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 844990129 is about 29068.7139206398. The cubic root of 844990129 is about 945.4035132765.

The spelling of 844990129 in words is "eight hundred forty-four million, nine hundred ninety thousand, one hundred twenty-nine".