520801 has 4 divisors (see below), whose sum is σ = 523204. Its totient is φ = 518400.

The previous prime is 520787. The next prime is 520813. The reversal of 520801 is 108025.

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 360000 + 160801 = 600^2 + 401^2 .

It is a 4-Lehmer number, since φ(520801) divides (520801-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 520801 - 2¹³ = 512609 is a prime.

It is a deceptive number, since it divides R₅₂₀₈₀₀.

It is a Duffinian number.

520801 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (520841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (130801).

2⁵²⁰⁸⁰¹ is an apocalyptic number.

It is an amenable number.

520801 is a deficient number, since it is larger than the sum of its proper divisors (2403).

520801 is a wasteful number, since it uses less digits than its factorization.

520801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 520801 is about 721.6654349489. The cubic root of 520801 is about 80.4557837499.

Adding to 520801 its reverse (108025), we get a palindrome (628826).

The spelling of 520801 in words is "five hundred twenty thousand, eight hundred one".