108491917 has 2 divisors, whose sum is σ = 108491918. Its totient is φ = 108491916.

The previous prime is 108491891. The next prime is 108491921. The reversal of 108491917 is 719194801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65707236 + 42784681 = 8106^2 + 6541^2 .

It is a cyclic number.

It is not a de Polignac number, because 108491917 - 2¹⁵ = 108459149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108491917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108491927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54245958 + 54245959.

It is an arithmetic number, because the mean of its divisors is an integer number (54245959).

Almost surely, 2^108491917 is an apocalyptic number.

It is an amenable number.

108491917 is a deficient number, since it is larger than the sum of its proper divisors (1).

108491917 is an equidigital number, since it uses as much as digits as its factorization.

108491917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 108491917 is about 10415.9453243573. The cubic root of 108491917 is about 476.9422479880.

The spelling of 108491917 in words is "one hundred eight million, four hundred ninety-one thousand, nine hundred seventeen".