521326530 has 80 divisors (see below), whose sum is σ = 1419707520. Its totient is φ = 137243808.

The previous prime is 521326529. The next prime is 521326571. The reversal of 521326530 is 35623125.

521326530 is a `hidden beast` number, since 5 + 2 + 1 + 3 + 2 + 653 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 521326494 and 521326503.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 59917 + ... + 68063.

It is an arithmetic number, because the mean of its divisors is an integer number (17746344).

Almost surely, 2^521326530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521326530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (709853760).

521326530 is an abundant number, since it is smaller than the sum of its proper divisors (898380990).

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

521326530 is a wasteful number, since it uses less digits than its factorization.

521326530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8245 (or 8236 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 521326530 is about 22832.5760701678. The cubic root of 521326530 is about 804.8283676632.

Adding to 521326530 its reverse (35623125), we get a palindrome (556949655).

The spelling of 521326530 in words is "five hundred twenty-one million, three hundred twenty-six thousand, five hundred thirty".