108819209 has 2 divisors, whose sum is σ = 108819210. Its totient is φ = 108819208.

The previous prime is 108819203. The next prime is 108819239. The reversal of 108819209 is 902918801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67897600 + 40921609 = 8240^2 + 6397^2 .

It is an emirp because it is prime and its reverse (902918801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108819209 - 2⁸ = 108818953 is a prime.

It is not a weakly prime, because it can be changed into another prime (108819203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54409604 + 54409605.

It is an arithmetic number, because the mean of its divisors is an integer number (54409605).

Almost surely, 2^108819209 is an apocalyptic number.

It is an amenable number.

108819209 is a deficient number, since it is larger than the sum of its proper divisors (1).

108819209 is an equidigital number, since it uses as much as digits as its factorization.

108819209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 108819209 is about 10431.6445970901. The cubic root of 108819209 is about 477.4213702385.

The spelling of 108819209 in words is "one hundred eight million, eight hundred nineteen thousand, two hundred nine".