521424520 has 16 divisors (see below), whose sum is σ = 1173205260. Its totient is φ = 208569792.

The previous prime is 521424517. The next prime is 521424521. The reversal of 521424520 is 25424125.

It can be written as a sum of positive squares in 2 ways, for example, as 425266884 + 96157636 = 20622^2 + 9806^2 .

It is not an unprimeable number, because it can be changed into a prime (521424521) 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 3 ways as a sum of consecutive naturals, for example, 6517767 + ... + 6517846.

Almost surely, 2^521424520 is an apocalyptic number.

It is an amenable number.

521424520 is an abundant number, since it is smaller than the sum of its proper divisors (651780740).

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

521424520 is a wasteful number, since it uses less digits than its factorization.

521424520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13035624 (or 13035620 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 521424520 is about 22834.7218069325. The cubic root of 521424520 is about 804.8787904382.

Adding to 521424520 its reverse (25424125), we get a palindrome (546848645).

The spelling of 521424520 in words is "five hundred twenty-one million, four hundred twenty-four thousand, five hundred twenty".