113105809 has 4 divisors (see below), whose sum is σ = 113135616. Its totient is φ = 113076004.

The previous prime is 113105779. The next prime is 113105821. The reversal of 113105809 is 908501311.

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: 908501311 = 23 ⋅39500057.

It is a cyclic number.

It is not a de Polignac number, because 113105809 - 2⁹ = 113105297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113105899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8209 + ... + 17134.

It is an arithmetic number, because the mean of its divisors is an integer number (28283904).

Almost surely, 2^113105809 is an apocalyptic number.

It is an amenable number.

113105809 is a deficient number, since it is larger than the sum of its proper divisors (29807).

113105809 is an equidigital number, since it uses as much as digits as its factorization.

113105809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29806.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 113105809 is about 10635.1214849667. The cubic root of 113105809 is about 483.6096632583.

The spelling of 113105809 in words is "one hundred thirteen million, one hundred five thousand, eight hundred nine".