844764121 has 2 divisors, whose sum is σ = 844764122. Its totient is φ = 844764120.

The previous prime is 844764097. The next prime is 844764133. The reversal of 844764121 is 121467448.

It is a happy number.

844764121 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., 827425225 + 17338896 = 28765^2 + 4164^2 .

It is a cyclic number.

It is not a de Polignac number, because 844764121 - 2¹³ = 844755929 is a prime.

It is not a weakly prime, because it can be changed into another prime (844764421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422382060 + 422382061.

It is an arithmetic number, because the mean of its divisors is an integer number (422382061).

Almost surely, 2^844764121 is an apocalyptic number.

It is an amenable number.

844764121 is a deficient number, since it is larger than the sum of its proper divisors (1).

844764121 is an equidigital number, since it uses as much as digits as its factorization.

844764121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 844764121 is about 29064.8261821742. The cubic root of 844764121 is about 945.3192172977.

The spelling of 844764121 in words is "eight hundred forty-four million, seven hundred sixty-four thousand, one hundred twenty-one".