108921017 has 2 divisors, whose sum is σ = 108921018. Its totient is φ = 108921016.

The previous prime is 108920993. The next prime is 108921019. The reversal of 108921017 is 710129801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67305616 + 41615401 = 8204^2 + 6451^2 .

It is an emirp because it is prime and its reverse (710129801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108921017 - 2⁶ = 108920953 is a prime.

Together with 108921019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (108921019) 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, 54460508 + 54460509.

It is an arithmetic number, because the mean of its divisors is an integer number (54460509).

Almost surely, 2^108921017 is an apocalyptic number.

It is an amenable number.

108921017 is a deficient number, since it is larger than the sum of its proper divisors (1).

108921017 is an equidigital number, since it uses as much as digits as its factorization.

108921017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 108921017 is about 10436.5232237561. The cubic root of 108921017 is about 477.5702108868.

The spelling of 108921017 in words is "one hundred eight million, nine hundred twenty-one thousand, seventeen".