505342009 has 2 divisors, whose sum is σ = 505342010. Its totient is φ = 505342008.

The previous prime is 505342001. The next prime is 505342027. The reversal of 505342009 is 900243505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499388409 + 5953600 = 22347^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 505342009 - 2³ = 505342001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505342001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252671004 + 252671005.

It is an arithmetic number, because the mean of its divisors is an integer number (252671005).

Almost surely, 2^505342009 is an apocalyptic number.

It is an amenable number.

505342009 is a deficient number, since it is larger than the sum of its proper divisors (1).

505342009 is an equidigital number, since it uses as much as digits as its factorization.

505342009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 505342009 is about 22479.8133666630. The cubic root of 505342009 is about 796.5171556018.

The spelling of 505342009 in words is "five hundred five million, three hundred forty-two thousand, nine".