521975 has 6 divisors (see below), whose sum is σ = 647280. Its totient is φ = 417560.

The previous prime is 521929. The next prime is 521981. The reversal of 521975 is 579125.

521975 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 521975 - 2¹⁶ = 456439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10415 + ... + 10464.

It is an arithmetic number, because the mean of its divisors is an integer number (107880).

2⁵²¹⁹⁷⁵ is an apocalyptic number.

521975 is a deficient number, since it is larger than the sum of its proper divisors (125305).

521975 is a wasteful number, since it uses less digits than its factorization.

521975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20889 (or 20884 counting only the distinct ones).

The product of its digits is 3150, while the sum is 29.

The square root of 521975 is about 722.4783733787. The cubic root of 521975 is about 80.5161933911.

The spelling of 521975 in words is "five hundred twenty-one thousand, nine hundred seventy-five".