108659809 has 2 divisors, whose sum is σ = 108659810. Its totient is φ = 108659808.

The previous prime is 108659791. The next prime is 108659819. The reversal of 108659809 is 908956801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96963409 + 11696400 = 9847^2 + 3420^2 .

It is an emirp because it is prime and its reverse (908956801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108659809 - 2⁵ = 108659777 is a prime.

It is not a weakly prime, because it can be changed into another prime (108659819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54329904 + 54329905.

It is an arithmetic number, because the mean of its divisors is an integer number (54329905).

Almost surely, 2^108659809 is an apocalyptic number.

It is an amenable number.

108659809 is a deficient number, since it is larger than the sum of its proper divisors (1).

108659809 is an equidigital number, since it uses as much as digits as its factorization.

108659809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 108659809 is about 10424.0015828855. The cubic root of 108659809 is about 477.1881450101.

The spelling of 108659809 in words is "one hundred eight million, six hundred fifty-nine thousand, eight hundred nine".