521475216 has 80 divisors (see below), whose sum is σ = 1467019200. Its totient is φ = 158989824.

The previous prime is 521475193. The next prime is 521475239. The reversal of 521475216 is 612574125.

It is an interprime number because it is at equal distance from previous prime (521475193) and next prime (521475239).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16590 + ... + 36306.

It is an arithmetic number, because the mean of its divisors is an integer number (18337740).

Almost surely, 2^521475216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521475216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733509600).

521475216 is an abundant number, since it is smaller than the sum of its proper divisors (945543984).

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

521475216 is a wasteful number, since it uses less digits than its factorization.

521475216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19776 (or 19770 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 521475216 is about 22835.8318438370. The cubic root of 521475216 is about 804.9048746308.

The spelling of 521475216 in words is "five hundred twenty-one million, four hundred seventy-five thousand, two hundred sixteen".