109198391 has 4 divisors (see below), whose sum is σ = 111258792. Its totient is φ = 107137992.

The previous prime is 109198387. The next prime is 109198403. The reversal of 109198391 is 193891901.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 109198391 - 2² = 109198387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109198091) 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, 1030121 + ... + 1030226.

It is an arithmetic number, because the mean of its divisors is an integer number (27814698).

Almost surely, 2^109198391 is an apocalyptic number.

109198391 is a deficient number, since it is larger than the sum of its proper divisors (2060401).

109198391 is an equidigital number, since it uses as much as digits as its factorization.

109198391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060400.

The product of its (nonzero) digits is 17496, while the sum is 41.

The square root of 109198391 is about 10449.8033952797. The cubic root of 109198391 is about 477.9752544626.

The spelling of 109198391 in words is "one hundred nine million, one hundred ninety-eight thousand, three hundred ninety-one".