520403213 has 6 divisors (see below), whose sum is σ = 572013582. Its totient is φ = 473093720.

The previous prime is 520403209. The next prime is 520403227. The reversal of 520403213 is 312304025.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 435431689 + 84971524 = 20867^2 + 9218^2 .

It is not a de Polignac number, because 520403213 - 2² = 520403209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520403263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2150306 + ... + 2150547.

It is an arithmetic number, because the mean of its divisors is an integer number (95335597).

Almost surely, 2^520403213 is an apocalyptic number.

It is an amenable number.

520403213 is a deficient number, since it is larger than the sum of its proper divisors (51610369).

520403213 is a wasteful number, since it uses less digits than its factorization.

520403213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300875 (or 4300864 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 520403213 is about 22812.3478186705. The cubic root of 520403213 is about 804.3529453129.

Adding to 520403213 its reverse (312304025), we get a palindrome (832707238).

The spelling of 520403213 in words is "five hundred twenty million, four hundred three thousand, two hundred thirteen".