518064821 has 2 divisors, whose sum is σ = 518064822. Its totient is φ = 518064820.

The previous prime is 518064793. The next prime is 518064823. The reversal of 518064821 is 128460815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271920100 + 246144721 = 16490^2 + 15689^2 .

It is a cyclic number.

It is not a de Polignac number, because 518064821 - 2¹⁴ = 518048437 is a prime.

Together with 518064823, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_27256166 and since 518064821 and 27256166 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518064823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259032410 + 259032411.

It is an arithmetic number, because the mean of its divisors is an integer number (259032411).

Almost surely, 2^518064821 is an apocalyptic number.

It is an amenable number.

518064821 is a deficient number, since it is larger than the sum of its proper divisors (1).

518064821 is an equidigital number, since it uses as much as digits as its factorization.

518064821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 518064821 is about 22761.0373445500. The cubic root of 518064821 is about 803.1463701581.

The spelling of 518064821 in words is "five hundred eighteen million, sixty-four thousand, eight hundred twenty-one".