109197805 has 4 divisors (see below), whose sum is σ = 131037372. Its totient is φ = 87358240.

The previous prime is 109197797. The next prime is 109197811. The reversal of 109197805 is 508791901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508791901 = 23 ⋅22121387.

It can be written as a sum of positive squares in 2 ways, for example, as 83503044 + 25694761 = 9138^2 + 5069^2 .

It is not a de Polignac number, because 109197805 - 2³ = 109197797 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10919776 + ... + 10919785.

It is an arithmetic number, because the mean of its divisors is an integer number (32759343).

Almost surely, 2^109197805 is an apocalyptic number.

It is an amenable number.

109197805 is a deficient number, since it is larger than the sum of its proper divisors (21839567).

109197805 is an equidigital number, since it uses as much as digits as its factorization.

109197805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21839566.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 109197805 is about 10449.7753564371. The cubic root of 109197805 is about 477.9743994622.

The spelling of 109197805 in words is "one hundred nine million, one hundred ninety-seven thousand, eight hundred five".