518931079493 has 2 divisors, whose sum is σ = 518931079494. Its totient is φ = 518931079492.

The previous prime is 518931079487. The next prime is 518931079549. The reversal of 518931079493 is 394970139815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509634648769 + 9296430724 = 713887^2 + 96418^2 .

It is a cyclic number.

It is not a de Polignac number, because 518931079493 - 2¹⁶ = 518931013957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518931079423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259465539746 + 259465539747.

It is an arithmetic number, because the mean of its divisors is an integer number (259465539747).

Almost surely, 2^518931079493 is an apocalyptic number.

It is an amenable number.

518931079493 is a deficient number, since it is larger than the sum of its proper divisors (1).

518931079493 is an equidigital number, since it uses as much as digits as its factorization.

518931079493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 518931079493 in words is "five hundred eighteen billion, nine hundred thirty-one million, seventy-nine thousand, four hundred ninety-three".