108205661 has 2 divisors, whose sum is σ = 108205662. Its totient is φ = 108205660.

The previous prime is 108205619. The next prime is 108205667. The reversal of 108205661 is 166502801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83265625 + 24940036 = 9125^2 + 4994^2 .

It is an emirp because it is prime and its reverse (166502801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108205661 - 2⁶ = 108205597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108205667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54102830 + 54102831.

It is an arithmetic number, because the mean of its divisors is an integer number (54102831).

Almost surely, 2^108205661 is an apocalyptic number.

It is an amenable number.

108205661 is a deficient number, since it is larger than the sum of its proper divisors (1).

108205661 is an equidigital number, since it uses as much as digits as its factorization.

108205661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 108205661 is about 10402.1950087470. The cubic root of 108205661 is about 476.5224077016.

The spelling of 108205661 in words is "one hundred eight million, two hundred five thousand, six hundred sixty-one".