518490257 has 2 divisors, whose sum is σ = 518490258. Its totient is φ = 518490256.

The previous prime is 518490253. The next prime is 518490263. The reversal of 518490257 is 752094815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325585936 + 192904321 = 18044^2 + 13889^2 .

It is a cyclic number.

It is not a de Polignac number, because 518490257 - 2² = 518490253 is a prime.

It is equal to p_27277385 and since 518490257 and 27277385 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (518490251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259245128 + 259245129.

It is an arithmetic number, because the mean of its divisors is an integer number (259245129).

Almost surely, 2^518490257 is an apocalyptic number.

It is an amenable number.

518490257 is a deficient number, since it is larger than the sum of its proper divisors (1).

518490257 is an equidigital number, since it uses as much as digits as its factorization.

518490257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 518490257 is about 22770.3811342718. The cubic root of 518490257 is about 803.3661585427.

The spelling of 518490257 in words is "five hundred eighteen million, four hundred ninety thousand, two hundred fifty-seven".