109391191 has 16 divisors (see below), whose sum is σ = 136539648. Its totient is φ = 85327200.

The previous prime is 109391173. The next prime is 109391207. The reversal of 109391191 is 191193901.

It is not a de Polignac number, because 109391191 - 2¹¹ = 109389143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109391111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2005 + ... + 14926.

It is an arithmetic number, because the mean of its divisors is an integer number (8533728).

Almost surely, 2^109391191 is an apocalyptic number.

109391191 is a deficient number, since it is larger than the sum of its proper divisors (27148457).

109391191 is a wasteful number, since it uses less digits than its factorization.

109391191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17022.

The product of its (nonzero) digits is 2187, while the sum is 34.

The square root of 109391191 is about 10459.0243808875. The cubic root of 109391191 is about 478.2563924478.

The spelling of 109391191 in words is "one hundred nine million, three hundred ninety-one thousand, one hundred ninety-one".