518042729 has 2 divisors, whose sum is σ = 518042730. Its totient is φ = 518042728.

The previous prime is 518042711. The next prime is 518042741. The reversal of 518042729 is 927240815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 508728025 + 9314704 = 22555^2 + 3052^2 .

It is a cyclic number.

It is not a de Polignac number, because 518042729 - 2²⁸ = 249607273 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 518042692 and 518042701.

It is not a weakly prime, because it can be changed into another prime (518045729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259021364 + 259021365.

It is an arithmetic number, because the mean of its divisors is an integer number (259021365).

Almost surely, 2^518042729 is an apocalyptic number.

It is an amenable number.

518042729 is a deficient number, since it is larger than the sum of its proper divisors (1).

518042729 is an equidigital number, since it uses as much as digits as its factorization.

518042729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 518042729 is about 22760.5520363633. The cubic root of 518042729 is about 803.1349537220.

The spelling of 518042729 in words is "five hundred eighteen million, forty-two thousand, seven hundred twenty-nine".