521044424 has 64 divisors (see below), whose sum is σ = 1056706560. Its totient is φ = 239984640.

The previous prime is 521044423. The next prime is 521044427. The reversal of 521044424 is 424440125.

It is a junction number, because it is equal to n+sod(n) for n = 521044393 and 521044402.

It is not an unprimeable number, because it can be changed into a prime (521044423) 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 15 ways as a sum of consecutive naturals, for example, 1675229 + ... + 1675539.

It is an arithmetic number, because the mean of its divisors is an integer number (16511040).

Almost surely, 2^521044424 is an apocalyptic number.

It is an amenable number.

521044424 is an abundant number, since it is smaller than the sum of its proper divisors (535662136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521044424 is a wasteful number, since it uses less digits than its factorization.

521044424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 521044424 is about 22826.3975256719. The cubic root of 521044424 is about 804.6831689155.

Adding to 521044424 its reverse (424440125), we get a palindrome (945484549).

The spelling of 521044424 in words is "five hundred twenty-one million, forty-four thousand, four hundred twenty-four".