196047809 has 2 divisors, whose sum is σ = 196047810. Its totient is φ = 196047808.

The previous prime is 196047779. The next prime is 196047853. The reversal of 196047809 is 908740691.

It is an a-pointer prime, because the next prime (196047853) can be obtained adding 196047809 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123321025 + 72726784 = 11105^2 + 8528^2 .

It is a cyclic number.

It is not a de Polignac number, because 196047809 - 2¹² = 196043713 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 196047809.

It is not a weakly prime, because it can be changed into another prime (196047889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98023904 + 98023905.

It is an arithmetic number, because the mean of its divisors is an integer number (98023905).

Almost surely, 2^196047809 is an apocalyptic number.

It is an amenable number.

196047809 is a deficient number, since it is larger than the sum of its proper divisors (1).

196047809 is an equidigital number, since it uses as much as digits as its factorization.

196047809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 196047809 is about 14001.7073601758. The cubic root of 196047809 is about 580.9257994890.

The spelling of 196047809 in words is "one hundred ninety-six million, forty-seven thousand, eight hundred nine".