108890861 has 2 divisors, whose sum is σ = 108890862. Its totient is φ = 108890860.

The previous prime is 108890849. The next prime is 108890893. The reversal of 108890861 is 168098801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108035236 + 855625 = 10394^2 + 925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108890861 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 (108890801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54445430 + 54445431.

It is an arithmetic number, because the mean of its divisors is an integer number (54445431).

Almost surely, 2^108890861 is an apocalyptic number.

It is an amenable number.

108890861 is a deficient number, since it is larger than the sum of its proper divisors (1).

108890861 is an equidigital number, since it uses as much as digits as its factorization.

108890861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 108890861 is about 10435.0783897391. The cubic root of 108890861 is about 477.5261332700.

The spelling of 108890861 in words is "one hundred eight million, eight hundred ninety thousand, eight hundred sixty-one".