518669969 has 2 divisors, whose sum is σ = 518669970. Its totient is φ = 518669968.

The previous prime is 518669953. The next prime is 518669971. The reversal of 518669969 is 969966815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408524944 + 110145025 = 20212^2 + 10495^2 .

It is a cyclic number.

It is not a de Polignac number, because 518669969 - 2⁴ = 518669953 is a prime.

It is a super-2 number, since 2×518669969² = 538037073484921922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 518669971, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (518669909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259334984 + 259334985.

It is an arithmetic number, because the mean of its divisors is an integer number (259334985).

Almost surely, 2^518669969 is an apocalyptic number.

It is an amenable number.

518669969 is a deficient number, since it is larger than the sum of its proper divisors (1).

518669969 is an equidigital number, since it uses as much as digits as its factorization.

518669969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6298560, while the sum is 59.

The square root of 518669969 is about 22774.3269713948. The cubic root of 518669969 is about 803.4589650837.

The spelling of 518669969 in words is "five hundred eighteen million, six hundred sixty-nine thousand, nine hundred sixty-nine".