495870209 has 2 divisors, whose sum is σ = 495870210. Its totient is φ = 495870208.

The previous prime is 495870191. The next prime is 495870223. The reversal of 495870209 is 902078594.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410953984 + 84916225 = 20272^2 + 9215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-495870209 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 495870209.

It is not a weakly prime, because it can be changed into another prime (495870289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247935104 + 247935105.

It is an arithmetic number, because the mean of its divisors is an integer number (247935105).

Almost surely, 2^495870209 is an apocalyptic number.

It is an amenable number.

495870209 is a deficient number, since it is larger than the sum of its proper divisors (1).

495870209 is an equidigital number, since it uses as much as digits as its factorization.

495870209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 495870209 is about 22268.1433667021. The cubic root of 495870209 is about 791.5092703872.

The spelling of 495870209 in words is "four hundred ninety-five million, eight hundred seventy thousand, two hundred nine".