521625 has 32 divisors (see below), whose sum is σ = 943488. Its totient is φ = 254400.

The previous prime is 521603. The next prime is 521641. The reversal of 521625 is 526125.

521625 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 521625 - 2⁷ = 521497 is a prime.

521625 is strictly pandigital in base 7.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 4822 + ... + 4928.

It is an arithmetic number, because the mean of its divisors is an integer number (29484).

2⁵²¹⁶²⁵ is an apocalyptic number.

It is an amenable number.

521625 is a deficient number, since it is larger than the sum of its proper divisors (421863).

521625 is a wasteful number, since it uses less digits than its factorization.

521625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 128 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 521625 is about 722.2361109776. The cubic root of 521625 is about 80.4981931876.

Adding to 521625 its product of digits (600), we get a palindrome (522225).

The spelling of 521625 in words is "five hundred twenty-one thousand, six hundred twenty-five".