108505909 has 2 divisors, whose sum is σ = 108505910. Its totient is φ = 108505908.

The previous prime is 108505889. The next prime is 108505913. The reversal of 108505909 is 909505801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69255684 + 39250225 = 8322^2 + 6265^2 .

It is a cyclic number.

It is not a de Polignac number, because 108505909 - 2¹¹ = 108503861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108502909) 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, 54252954 + 54252955.

It is an arithmetic number, because the mean of its divisors is an integer number (54252955).

Almost surely, 2^108505909 is an apocalyptic number.

It is an amenable number.

108505909 is a deficient number, since it is larger than the sum of its proper divisors (1).

108505909 is an equidigital number, since it uses as much as digits as its factorization.

108505909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 108505909 is about 10416.6169652148. The cubic root of 108505909 is about 476.9627505571.

The spelling of 108505909 in words is "one hundred eight million, five hundred five thousand, nine hundred nine".