518674721 has 2 divisors, whose sum is σ = 518674722. Its totient is φ = 518674720.

The previous prime is 518674697. The next prime is 518674727. The reversal of 518674721 is 127476815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512524321 + 6150400 = 22639^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 518674721 - 2¹⁸ = 518412577 is a prime.

It is not a weakly prime, because it can be changed into another prime (518674727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259337360 + 259337361.

It is an arithmetic number, because the mean of its divisors is an integer number (259337361).

Almost surely, 2^518674721 is an apocalyptic number.

It is an amenable number.

518674721 is a deficient number, since it is larger than the sum of its proper divisors (1).

518674721 is an equidigital number, since it uses as much as digits as its factorization.

518674721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 41.

The square root of 518674721 is about 22774.4312991565. The cubic root of 518674721 is about 803.4614188119.

The spelling of 518674721 in words is "five hundred eighteen million, six hundred seventy-four thousand, seven hundred twenty-one".