516730321 has 2 divisors, whose sum is σ = 516730322. Its totient is φ = 516730320.

The previous prime is 516730309. The next prime is 516730367. The reversal of 516730321 is 123037615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504227025 + 12503296 = 22455^2 + 3536^2 .

It is a cyclic number.

It is not a de Polignac number, because 516730321 - 2²¹ = 514633169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 516730321.

It is not a weakly prime, because it can be changed into another prime (516730301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258365160 + 258365161.

It is an arithmetic number, because the mean of its divisors is an integer number (258365161).

Almost surely, 2^516730321 is an apocalyptic number.

It is an amenable number.

516730321 is a deficient number, since it is larger than the sum of its proper divisors (1).

516730321 is an equidigital number, since it uses as much as digits as its factorization.

516730321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 516730321 is about 22731.7029938366. The cubic root of 516730321 is about 802.4561602329.

Adding to 516730321 its reverse (123037615), we get a palindrome (639767936).

The spelling of 516730321 in words is "five hundred sixteen million, seven hundred thirty thousand, three hundred twenty-one".