505055009 has 2 divisors, whose sum is σ = 505055010. Its totient is φ = 505055008.

The previous prime is 505055003. The next prime is 505055053. The reversal of 505055009 is 900550505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307230784 + 197824225 = 17528^2 + 14065^2 .

It is a cyclic number.

It is not a de Polignac number, because 505055009 - 2²⁸ = 236619553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505055003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252527504 + 252527505.

It is an arithmetic number, because the mean of its divisors is an integer number (252527505).

Almost surely, 2^505055009 is an apocalyptic number.

It is an amenable number.

505055009 is a deficient number, since it is larger than the sum of its proper divisors (1).

505055009 is an equidigital number, since it uses as much as digits as its factorization.

505055009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5625, while the sum is 29.

The square root of 505055009 is about 22473.4289551016. The cubic root of 505055009 is about 796.3663377993.

The spelling of 505055009 in words is "five hundred five million, fifty-five thousand, nine".