520243321 has 4 divisors (see below), whose sum is σ = 560262052. Its totient is φ = 480224592.

The previous prime is 520243303. The next prime is 520243357. The reversal of 520243321 is 123342025.

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 358572096 + 161671225 = 18936^2 + 12715^2 .

It is a cyclic number.

It is not a de Polignac number, because 520243321 - 2⁵ = 520243289 is a prime.

It is a super-2 number, since 2×520243321² = 541306226090218082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520243292 and 520243301.

It is not an unprimeable number, because it can be changed into a prime (520243391) 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, 20009346 + ... + 20009371.

It is an arithmetic number, because the mean of its divisors is an integer number (140065513).

Almost surely, 2^520243321 is an apocalyptic number.

It is an amenable number.

520243321 is a deficient number, since it is larger than the sum of its proper divisors (40018731).

520243321 is a wasteful number, since it uses less digits than its factorization.

520243321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40018730.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 520243321 is about 22808.8430438723. The cubic root of 520243321 is about 804.2705586995.

Adding to 520243321 its reverse (123342025), we get a palindrome (643585346).

The spelling of 520243321 in words is "five hundred twenty million, two hundred forty-three thousand, three hundred twenty-one".