108921309 has 8 divisors (see below), whose sum is σ = 165975360. Its totient is φ = 62240736.

The previous prime is 108921299. The next prime is 108921311. The reversal of 108921309 is 903129801.

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

It is not a de Polignac number, because 108921309 - 2⁵ = 108921277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108921309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108921349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2593344 + ... + 2593385.

It is an arithmetic number, because the mean of its divisors is an integer number (20746920).

Almost surely, 2^108921309 is an apocalyptic number.

It is an amenable number.

108921309 is a deficient number, since it is larger than the sum of its proper divisors (57054051).

108921309 is an equidigital number, since it uses as much as digits as its factorization.

108921309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5186739.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 108921309 is about 10436.5372130798. The cubic root of 108921309 is about 477.5706376498.

The spelling of 108921309 in words is "one hundred eight million, nine hundred twenty-one thousand, three hundred nine".