518568397 has 2 divisors, whose sum is σ = 518568398. Its totient is φ = 518568396.

The previous prime is 518568383. The next prime is 518568461. The reversal of 518568397 is 793865815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 295633636 + 222934761 = 17194^2 + 14931^2 .

It is a cyclic number.

It is not a de Polignac number, because 518568397 - 2²⁷ = 384350669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518568307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259284198 + 259284199.

It is an arithmetic number, because the mean of its divisors is an integer number (259284199).

Almost surely, 2^518568397 is an apocalyptic number.

It is an amenable number.

518568397 is a deficient number, since it is larger than the sum of its proper divisors (1).

518568397 is an equidigital number, since it uses as much as digits as its factorization.

518568397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 52.

The square root of 518568397 is about 22772.0968951039. The cubic root of 518568397 is about 803.4065140926.

The spelling of 518568397 in words is "five hundred eighteen million, five hundred sixty-eight thousand, three hundred ninety-seven".