108090809 has 4 divisors (see below), whose sum is σ = 108153216. Its totient is φ = 108028404.

The previous prime is 108090781. The next prime is 108090821. The reversal of 108090809 is 908090801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908090801 = 17599 ⋅51599.

It is not a de Polignac number, because 108090809 - 2²⁰ = 107042233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (108090509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28529 + ... + 32094.

It is an arithmetic number, because the mean of its divisors is an integer number (27038304).

Almost surely, 2^108090809 is an apocalyptic number.

It is an amenable number.

108090809 is a deficient number, since it is larger than the sum of its proper divisors (62407).

108090809 is an equidigital number, since it uses as much as digits as its factorization.

108090809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62406.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 108090809 is about 10396.6729774481. The cubic root of 108090809 is about 476.3537507009.

The spelling of 108090809 in words is "one hundred eight million, ninety thousand, eight hundred nine".