108989191 has 2 divisors, whose sum is σ = 108989192. Its totient is φ = 108989190.

The previous prime is 108989173. The next prime is 108989207. The reversal of 108989191 is 191989801.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 108989191 - 2¹⁹ = 108464903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108989171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54494595 + 54494596.

It is an arithmetic number, because the mean of its divisors is an integer number (54494596).

Almost surely, 2^108989191 is an apocalyptic number.

108989191 is a deficient number, since it is larger than the sum of its proper divisors (1).

108989191 is an equidigital number, since it uses as much as digits as its factorization.

108989191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 46.

The square root of 108989191 is about 10439.7888388607. The cubic root of 108989191 is about 477.6698276615.

The spelling of 108989191 in words is "one hundred eight million, nine hundred eighty-nine thousand, one hundred ninety-one".