109915809 has 4 divisors (see below), whose sum is σ = 146554416. Its totient is φ = 73277204.

The previous prime is 109915777. The next prime is 109915811. The reversal of 109915809 is 908519901.

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.

It is a cyclic number.

It is not a de Polignac number, because 109915809 - 2⁵ = 109915777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109915889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18319299 + ... + 18319304.

It is an arithmetic number, because the mean of its divisors is an integer number (36638604).

Almost surely, 2^109915809 is an apocalyptic number.

It is an amenable number.

109915809 is a deficient number, since it is larger than the sum of its proper divisors (36638607).

109915809 is an equidigital number, since it uses as much as digits as its factorization.

109915809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36638606.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 109915809 is about 10484.0740649807. The cubic root of 109915809 is about 479.0197137703.

The spelling of 109915809 in words is "one hundred nine million, nine hundred fifteen thousand, eight hundred nine".