521575 has 12 divisors (see below), whose sum is σ = 668608. Its totient is φ = 403200.

The previous prime is 521567. The next prime is 521581. The reversal of 521575 is 575125.

It is a happy number.

It is not a de Polignac number, because 521575 - 2³ = 521567 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439 + ... + 1111.

2⁵²¹⁵⁷⁵ is an apocalyptic number.

521575 is a deficient number, since it is larger than the sum of its proper divisors (147033).

521575 is a wasteful number, since it uses less digits than its factorization.

521575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 709 counting only the distinct ones).

The product of its digits is 1750, while the sum is 25.

The square root of 521575 is about 722.2014954291. The cubic root of 521575 is about 80.4956210727.

Adding to 521575 its product of digits (1750), we get a palindrome (523325).

The spelling of 521575 in words is "five hundred twenty-one thousand, five hundred seventy-five".