518966321 has 2 divisors, whose sum is σ = 518966322. Its totient is φ = 518966320.

The previous prime is 518966317. The next prime is 518966347. The reversal of 518966321 is 123669815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 495685696 + 23280625 = 22264^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 518966321 - 2² = 518966317 is a prime.

It is not a weakly prime, because it can be changed into another prime (518966821) 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, 259483160 + 259483161.

It is an arithmetic number, because the mean of its divisors is an integer number (259483161).

Almost surely, 2^518966321 is an apocalyptic number.

It is an amenable number.

518966321 is a deficient number, since it is larger than the sum of its proper divisors (1).

518966321 is an equidigital number, since it uses as much as digits as its factorization.

518966321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 518966321 is about 22780.8323157869. The cubic root of 518966321 is about 803.6119598273.

The spelling of 518966321 in words is "five hundred eighteen million, nine hundred sixty-six thousand, three hundred twenty-one".