521713 has 4 divisors (see below), whose sum is σ = 552420. Its totient is φ = 491008.

The previous prime is 521707. The next prime is 521723. The reversal of 521713 is 317125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 478864 + 42849 = 692^2 + 207^2 .

It is a cyclic number.

It is not a de Polignac number, because 521713 - 2⁹ = 521201 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 15328 + ... + 15361.

It is an arithmetic number, because the mean of its divisors is an integer number (138105).

2⁵²¹⁷¹³ is an apocalyptic number.

It is an amenable number.

521713 is a deficient number, since it is larger than the sum of its proper divisors (30707).

521713 is a wasteful number, since it uses less digits than its factorization.

521713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30706.

The product of its digits is 210, while the sum is 19.

The square root of 521713 is about 722.2970303137. The cubic root of 521713 is about 80.5027197106.

Adding to 521713 its reverse (317125), we get a palindrome (838838).

The spelling of 521713 in words is "five hundred twenty-one thousand, seven hundred thirteen".