520861 has 4 divisors (see below), whose sum is σ = 568224. Its totient is φ = 473500.

The previous prime is 520853. The next prime is 520867. The reversal of 520861 is 168025.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520861 - 2³ = 520853 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520867) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 23665 + ... + 23686.

It is an arithmetic number, because the mean of its divisors is an integer number (142056).

2⁵²⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

520861 is a deficient number, since it is larger than the sum of its proper divisors (47363).

520861 is a wasteful number, since it uses less digits than its factorization.

520861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47362.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 520861 is about 721.7070042614. The cubic root of 520861 is about 80.4588733251.

Adding to 520861 its reverse (168025), we get a palindrome (688886).

Subtracting from 520861 its reverse (168025), we obtain a square (352836 = 594²).

The spelling of 520861 in words is "five hundred twenty thousand, eight hundred sixty-one".