520851 has 4 divisors (see below), whose sum is σ = 694472. Its totient is φ = 347232.

The previous prime is 520841. The next prime is 520853. The reversal of 520851 is 158025.

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

It is not a de Polignac number, because 520851 - 2⁶ = 520787 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520853) 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, 86806 + ... + 86811.

It is an arithmetic number, because the mean of its divisors is an integer number (173618).

2⁵²⁰⁸⁵¹ is an apocalyptic number.

520851 is a deficient number, since it is larger than the sum of its proper divisors (173621).

520851 is a wasteful number, since it uses less digits than its factorization.

520851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173620.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 520851 is about 721.7000762089. The cubic root of 520851 is about 80.4583584124.

Adding to 520851 its reverse (158025), we get a palindrome (678876).

The spelling of 520851 in words is "five hundred twenty thousand, eight hundred fifty-one".