506345209 has 2 divisors, whose sum is σ = 506345210. Its totient is φ = 506345208.

The previous prime is 506345183. The next prime is 506345243. The reversal of 506345209 is 902543605.

It is an a-pointer prime, because the next prime (506345243) can be obtained adding 506345209 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438776809 + 67568400 = 20947^2 + 8220^2 .

It is a cyclic number.

It is not a de Polignac number, because 506345209 - 2⁹ = 506344697 is a prime.

It is not a weakly prime, because it can be changed into another prime (506345309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253172604 + 253172605.

It is an arithmetic number, because the mean of its divisors is an integer number (253172605).

Almost surely, 2^506345209 is an apocalyptic number.

It is an amenable number.

506345209 is a deficient number, since it is larger than the sum of its proper divisors (1).

506345209 is an equidigital number, since it uses as much as digits as its factorization.

506345209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 506345209 is about 22502.1156560889. The cubic root of 506345209 is about 797.0438865501.

The spelling of 506345209 in words is "five hundred six million, three hundred forty-five thousand, two hundred nine".