521893 has 4 divisors (see below), whose sum is σ = 544608. Its totient is φ = 499180.

The previous prime is 521887. The next prime is 521897. The reversal of 521893 is 398125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521893 - 2⁵ = 521861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11323 + ... + 11368.

It is an arithmetic number, because the mean of its divisors is an integer number (136152).

2⁵²¹⁸⁹³ is an apocalyptic number.

It is an amenable number.

521893 is a deficient number, since it is larger than the sum of its proper divisors (22715).

521893 is a wasteful number, since it uses less digits than its factorization.

521893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22714.

The product of its digits is 2160, while the sum is 28.

The square root of 521893 is about 722.4216220463. The cubic root of 521893 is about 80.5119769225.

The spelling of 521893 in words is "five hundred twenty-one thousand, eight hundred ninety-three".