521044641 has 24 divisors (see below), whose sum is σ = 811288296. Its totient is φ = 320336640.

The previous prime is 521044637. The next prime is 521044663. The reversal of 521044641 is 146440125.

521044641 is a `hidden beast` number, since 5 + 2 + 10 + 4 + 4 + 641 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 119443041 + 401601600 = 10929^2 + 20040^2 .

It is not a de Polignac number, because 521044641 - 2² = 521044637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521044681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216541 + ... + 218933.

It is an arithmetic number, because the mean of its divisors is an integer number (33803679).

Almost surely, 2^521044641 is an apocalyptic number.

It is an amenable number.

521044641 is a deficient number, since it is larger than the sum of its proper divisors (290243655).

521044641 is a wasteful number, since it uses less digits than its factorization.

521044641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273 (or 4270 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 521044641 is about 22826.4022789401. The cubic root of 521044641 is about 804.6832806246.

Adding to 521044641 its reverse (146440125), we get a palindrome (667484766).

The spelling of 521044641 in words is "five hundred twenty-one million, forty-four thousand, six hundred forty-one".