108509691 has 8 divisors (see below), whose sum is σ = 153190224. Its totient is φ = 68084480.

The previous prime is 108509671. The next prime is 108509693. The reversal of 108509691 is 196905801.

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 108509691 - 2⁵ = 108509659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (108509693) 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, 1063770 + ... + 1063871.

It is an arithmetic number, because the mean of its divisors is an integer number (19148778).

Almost surely, 2^108509691 is an apocalyptic number.

108509691 is a deficient number, since it is larger than the sum of its proper divisors (44680533).

108509691 is a wasteful number, since it uses less digits than its factorization.

108509691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127661.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 108509691 is about 10416.7985004991. The cubic root of 108509691 is about 476.9682920438.

The spelling of 108509691 in words is "one hundred eight million, five hundred nine thousand, six hundred ninety-one".