520102321 has 4 divisors (see below), whose sum is σ = 520165492. Its totient is φ = 520039152.

The previous prime is 520102313. The next prime is 520102337. The reversal of 520102321 is 123201025.

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 396447921 + 123654400 = 19911^2 + 11120^2 .

It is a cyclic number.

It is not a de Polignac number, because 520102321 - 2³ = 520102313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520102295 and 520102304.

It is not an unprimeable number, because it can be changed into a prime (520102391) 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, 16986 + ... + 36451.

It is an arithmetic number, because the mean of its divisors is an integer number (130041373).

Almost surely, 2^520102321 is an apocalyptic number.

It is an amenable number.

520102321 is a deficient number, since it is larger than the sum of its proper divisors (63171).

520102321 is an equidigital number, since it uses as much as digits as its factorization.

520102321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63170.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 520102321 is about 22805.7519279676. The cubic root of 520102321 is about 804.1978924485.

Adding to 520102321 its reverse (123201025), we get a palindrome (643303346).

The spelling of 520102321 in words is "five hundred twenty million, one hundred two thousand, three hundred twenty-one".