520402321 has 2 divisors, whose sum is σ = 520402322. Its totient is φ = 520402320.

The previous prime is 520402273. The next prime is 520402339. The reversal of 520402321 is 123204025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 326886400 + 193515921 = 18080^2 + 13911^2 .

It is a cyclic number.

It is not a de Polignac number, because 520402321 - 2⁹ = 520401809 is a prime.

It is not a weakly prime, because it can be changed into another prime (520405321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260201160 + 260201161.

It is an arithmetic number, because the mean of its divisors is an integer number (260201161).

Almost surely, 2^520402321 is an apocalyptic number.

It is an amenable number.

520402321 is a deficient number, since it is larger than the sum of its proper divisors (1).

520402321 is an equidigital number, since it uses as much as digits as its factorization.

520402321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 520402321 is about 22812.3282678468. The cubic root of 520402321 is about 804.3524857441.

Adding to 520402321 its reverse (123204025), we get a palindrome (643606346).

The spelling of 520402321 in words is "five hundred twenty million, four hundred two thousand, three hundred twenty-one".