521284 has 15 divisors (see below), whose sum is σ = 962927. Its totient is φ = 246924.

The previous prime is 521281. The next prime is 521299. The reversal of 521284 is 482125.

The square root of 521284 is 722.

It is a perfect power (a square), and thus also a powerful number.

It is an ABA number since it can be written as A⋅B^A, here for A=4, B=19.

It is a Duffinian number.

Its product of digits (640) is a multiple of the sum of its prime factors (80).

It is not an unprimeable number, because it can be changed into a prime (521281) by changing a digit.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 27427 + ... + 27445.

521284 is a Friedman number, since it can be written as (48*15+2)^2, using all its digits and the basic arithmetic operations.

2⁵²¹²⁸⁴ is an apocalyptic number.

521284 is the 722-nd square number.

It is an amenable number.

521284 is a deficient number, since it is larger than the sum of its proper divisors (441643).

521284 is an frugal number, since it uses more digits than its factorization.

521284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 21 counting only the distinct ones).

The product of its digits is 640, while the sum is 22.

The cubic root of 521284 is about 80.4806481008.

The spelling of 521284 in words is "five hundred twenty-one thousand, two hundred eighty-four".