844225521 has 16 divisors (see below), whose sum is σ = 1141094400. Its totient is φ = 555102288.

The previous prime is 844225519. The next prime is 844225523. The reversal of 844225521 is 125522448.

It is an interprime number because it is at equal distance from previous prime (844225519) and next prime (844225523).

It is not a de Polignac number, because 844225521 - 2¹ = 844225519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (844225523) 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 in 15 ways as a sum of consecutive naturals, for example, 413020 + ... + 415058.

It is an arithmetic number, because the mean of its divisors is an integer number (71318400).

Almost surely, 2^844225521 is an apocalyptic number.

It is an amenable number.

844225521 is a deficient number, since it is larger than the sum of its proper divisors (296868879).

844225521 is a wasteful number, since it uses less digits than its factorization.

844225521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868.

The product of its digits is 25600, while the sum is 33.

The square root of 844225521 is about 29055.5592098999. The cubic root of 844225521 is about 945.1182707996.

Adding to 844225521 its reverse (125522448), we get a palindrome (969747969).

The spelling of 844225521 in words is "eight hundred forty-four million, two hundred twenty-five thousand, five hundred twenty-one".