521895 has 16 divisors (see below), whose sum is σ = 911232. Its totient is φ = 252960.

The previous prime is 521887. The next prime is 521897. The reversal of 521895 is 598125.

It is not a de Polignac number, because 521895 - 2³ = 521887 is a prime.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1417 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (56952).

2⁵²¹⁸⁹⁵ is an apocalyptic number.

521895 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

521895 is a deficient number, since it is larger than the sum of its proper divisors (389337).

521895 is a wasteful number, since it uses less digits than its factorization.

521895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182.

The product of its digits is 3600, while the sum is 30.

The square root of 521895 is about 722.4230062782. The cubic root of 521895 is about 80.5120797684.

The spelling of 521895 in words is "five hundred twenty-one thousand, eight hundred ninety-five".