108689891 has 8 divisors (see below), whose sum is σ = 115271424. Its totient is φ = 102129280.

The previous prime is 108689873. The next prime is 108689921. The reversal of 108689891 is 198986801.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 108689891 - 2⁶ = 108689827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (108689491) 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 in 7 ways as a sum of consecutive naturals, for example, 6206 + ... + 15996.

It is an arithmetic number, because the mean of its divisors is an integer number (14408928).

Almost surely, 2^108689891 is an apocalyptic number.

108689891 is a deficient number, since it is larger than the sum of its proper divisors (6581533).

108689891 is an equidigital number, since it uses as much as digits as its factorization.

108689891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10461.

The product of its (nonzero) digits is 248832, while the sum is 50.

The square root of 108689891 is about 10425.4444029979. Note that the first 4 decimals coincide. The cubic root of 108689891 is about 477.2321767744.

The spelling of 108689891 in words is "one hundred eight million, six hundred eighty-nine thousand, eight hundred ninety-one".