505508669 has 2 divisors, whose sum is σ = 505508670. Its totient is φ = 505508668.

The previous prime is 505508659. The next prime is 505508671. The reversal of 505508669 is 966805505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400200025 + 105308644 = 20005^2 + 10262^2 .

It is a cyclic number.

It is not a de Polignac number, because 505508669 - 2²⁰ = 504460093 is a prime.

It is a super-2 number, since 2×505508669² = 511078028868303122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 505508671, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505508609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252754334 + 252754335.

It is an arithmetic number, because the mean of its divisors is an integer number (252754335).

Almost surely, 2^505508669 is an apocalyptic number.

It is an amenable number.

505508669 is a deficient number, since it is larger than the sum of its proper divisors (1).

505508669 is an equidigital number, since it uses as much as digits as its factorization.

505508669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 44.

The square root of 505508669 is about 22483.5199423934. The cubic root of 505508669 is about 796.6047088207.

The spelling of 505508669 in words is "five hundred five million, five hundred eight thousand, six hundred sixty-nine".