521725 has 12 divisors (see below), whose sum is σ = 664020. Its totient is φ = 406400.

The previous prime is 521723. The next prime is 521743. The reversal of 521725 is 527125.

521725 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 6 ways, for example, as 33124 + 488601 = 182^2 + 699^2 .

It is not a de Polignac number, because 521725 - 2¹ = 521723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521696 and 521705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 771 + ... + 1279.

It is an arithmetic number, because the mean of its divisors is an integer number (55335).

2⁵²¹⁷²⁵ is an apocalyptic number.

It is an amenable number.

521725 is a deficient number, since it is larger than the sum of its proper divisors (142295).

521725 is a wasteful number, since it uses less digits than its factorization.

521725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 555 counting only the distinct ones).

The product of its digits is 700, while the sum is 22.

The square root of 521725 is about 722.3053370978. The cubic root of 521725 is about 80.5033369243.

The spelling of 521725 in words is "five hundred twenty-one thousand, seven hundred twenty-five".