109197187 has 4 divisors (see below), whose sum is σ = 119124216. Its totient is φ = 99270160.

The previous prime is 109197163. The next prime is 109197191. The reversal of 109197187 is 781791901.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-109197187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109197287) 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, 4963498 + ... + 4963519.

It is an arithmetic number, because the mean of its divisors is an integer number (29781054).

Almost surely, 2^109197187 is an apocalyptic number.

109197187 is a deficient number, since it is larger than the sum of its proper divisors (9927029).

109197187 is an equidigital number, since it uses as much as digits as its factorization.

109197187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9927028.

The product of its (nonzero) digits is 31752, while the sum is 43.

The square root of 109197187 is about 10449.7457863816. The cubic root of 109197187 is about 477.9734977691.

The spelling of 109197187 in words is "one hundred nine million, one hundred ninety-seven thousand, one hundred eighty-seven".