409636109 has 2 divisors, whose sum is σ = 409636110. Its totient is φ = 409636108.

The previous prime is 409636081. The next prime is 409636151. The reversal of 409636109 is 901636904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345588100 + 64048009 = 18590^2 + 8003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409636109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409636609) 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, 204818054 + 204818055.

It is an arithmetic number, because the mean of its divisors is an integer number (204818055).

Almost surely, 2^409636109 is an apocalyptic number.

It is an amenable number.

409636109 is a deficient number, since it is larger than the sum of its proper divisors (1).

409636109 is an equidigital number, since it uses as much as digits as its factorization.

409636109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 409636109 is about 20239.4690888867. The cubic root of 409636109 is about 742.6760360612.

The spelling of 409636109 in words is "four hundred nine million, six hundred thirty-six thousand, one hundred nine".