521225 has 6 divisors (see below), whose sum is σ = 646350. Its totient is φ = 416960.

The previous prime is 521201. The next prime is 521231. The reversal of 521225 is 522125.

It can be written as a sum of positive squares in 3 ways, for example, as 121801 + 399424 = 349^2 + 632^2 .

It is not a de Polignac number, because 521225 - 2⁶ = 521161 is a prime.

It is a Curzon 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, 10400 + ... + 10449.

It is an arithmetic number, because the mean of its divisors is an integer number (107725).

2⁵²¹²²⁵ is an apocalyptic number.

It is an amenable number.

521225 is a deficient number, since it is larger than the sum of its proper divisors (125125).

521225 is a wasteful number, since it uses less digits than its factorization.

521225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20859 (or 20854 counting only the distinct ones).

The product of its digits is 200, while the sum is 17.

The square root of 521225 is about 721.9591401181. The cubic root of 521225 is about 80.4776116643.

Subtracting 521225 from its reverse (522125), we obtain a square (900 = 30²).

The spelling of 521225 in words is "five hundred twenty-one thousand, two hundred twenty-five".