518340649 has 2 divisors, whose sum is σ = 518340650. Its totient is φ = 518340648.

The previous prime is 518340643. The next prime is 518340703. The reversal of 518340649 is 946043815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438148624 + 80192025 = 20932^2 + 8955^2 .

It is a cyclic number.

It is not a de Polignac number, because 518340649 - 2¹⁷ = 518209577 is a prime.

It is not a weakly prime, because it can be changed into another prime (518340643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259170324 + 259170325.

It is an arithmetic number, because the mean of its divisors is an integer number (259170325).

Almost surely, 2^518340649 is an apocalyptic number.

It is an amenable number.

518340649 is a deficient number, since it is larger than the sum of its proper divisors (1).

518340649 is an equidigital number, since it uses as much as digits as its factorization.

518340649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 518340649 is about 22767.0957524231. The cubic root of 518340649 is about 803.2888818954.

The spelling of 518340649 in words is "five hundred eighteen million, three hundred forty thousand, six hundred forty-nine".