518312686909 has 2 divisors, whose sum is σ = 518312686910. Its totient is φ = 518312686908.

The previous prime is 518312686901. The next prime is 518312686939. The reversal of 518312686909 is 909686213815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310031808025 + 208280878884 = 556805^2 + 456378^2 .

It is a cyclic number.

It is not a de Polignac number, because 518312686909 - 2³ = 518312686901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518312686901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259156343454 + 259156343455.

It is an arithmetic number, because the mean of its divisors is an integer number (259156343455).

Almost surely, 2^518312686909 is an apocalyptic number.

It is an amenable number.

518312686909 is a deficient number, since it is larger than the sum of its proper divisors (1).

518312686909 is an equidigital number, since it uses as much as digits as its factorization.

518312686909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 518312686909 in words is "five hundred eighteen billion, three hundred twelve million, six hundred eighty-six thousand, nine hundred nine".