518931079549 has 2 divisors, whose sum is σ = 518931079550. Its totient is φ = 518931079548.

The previous prime is 518931079493. The next prime is 518931079571. The reversal of 518931079549 is 945970139815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 441859325625 + 77071753924 = 664725^2 + 277618^2 .

It is a cyclic number.

It is not a de Polignac number, because 518931079549 - 2¹¹ = 518931077501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518931070549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259465539774 + 259465539775.

It is an arithmetic number, because the mean of its divisors is an integer number (259465539775).

Almost surely, 2^518931079549 is an apocalyptic number.

It is an amenable number.

518931079549 is a deficient number, since it is larger than the sum of its proper divisors (1).

518931079549 is an equidigital number, since it uses as much as digits as its factorization.

518931079549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12247200, while the sum is 61.

The spelling of 518931079549 in words is "five hundred eighteen billion, nine hundred thirty-one million, seventy-nine thousand, five hundred forty-nine".