518259997 has 2 divisors, whose sum is σ = 518259998. Its totient is φ = 518259996.

The previous prime is 518259991. The next prime is 518260003. The reversal of 518259997 is 799952815.

It is a balanced prime because it is at equal distance from previous prime (518259991) and next prime (518260003).

It can be written as a sum of positive squares in only one way, i.e., 337787641 + 180472356 = 18379^2 + 13434^2 .

It is a cyclic number.

It is not a de Polignac number, because 518259997 - 2⁷ = 518259869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518259991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259129998 + 259129999.

It is an arithmetic number, because the mean of its divisors is an integer number (259129999).

Almost surely, 2^518259997 is an apocalyptic number.

It is an amenable number.

518259997 is a deficient number, since it is larger than the sum of its proper divisors (1).

518259997 is an equidigital number, since it uses as much as digits as its factorization.

518259997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 55.

The square root of 518259997 is about 22765.3244431086. The cubic root of 518259997 is about 803.2472167501.

The spelling of 518259997 in words is "five hundred eighteen million, two hundred fifty-nine thousand, nine hundred ninety-seven".