520523321 has 2 divisors, whose sum is σ = 520523322. Its totient is φ = 520523320.

The previous prime is 520523317. The next prime is 520523329. The reversal of 520523321 is 123325025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 326199721 + 194323600 = 18061^2 + 13940^2 .

It is a cyclic number.

It is not a de Polignac number, because 520523321 - 2² = 520523317 is a prime.

It is not a weakly prime, because it can be changed into another prime (520523329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260261660 + 260261661.

It is an arithmetic number, because the mean of its divisors is an integer number (260261661).

Almost surely, 2^520523321 is an apocalyptic number.

It is an amenable number.

520523321 is a deficient number, since it is larger than the sum of its proper divisors (1).

520523321 is an equidigital number, since it uses as much as digits as its factorization.

520523321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 520523321 is about 22814.9801884639. The cubic root of 520523321 is about 804.4148215592.

Adding to 520523321 its reverse (123325025), we get a palindrome (643848346).

The spelling of 520523321 in words is "five hundred twenty million, five hundred twenty-three thousand, three hundred twenty-one".