520561 has 4 divisors (see below), whose sum is σ = 526500. Its totient is φ = 514624.

The previous prime is 520549. The next prime is 520567. The reversal of 520561 is 165025.

It is a happy number.

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 136161 + 384400 = 369^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 520561 - 2⁵ = 520529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520567) 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, 2836 + ... + 3013.

It is an arithmetic number, because the mean of its divisors is an integer number (131625).

2⁵²⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

520561 is a deficient number, since it is larger than the sum of its proper divisors (5939).

520561 is an equidigital number, since it uses as much as digits as its factorization.

520561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5938.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 520561 is about 721.4991337486. The cubic root of 520561 is about 80.4434230753.

Adding to 520561 its reverse (165025), we get a palindrome (685586).

It can be divided in two parts, 520 and 561, that added together give a triangular number (1081 = T₄₆).

The spelling of 520561 in words is "five hundred twenty thousand, five hundred sixty-one".