109195991 has 16 divisors (see below), whose sum is σ = 116964000. Its totient is φ = 101743488.

The previous prime is 109195979. The next prime is 109196011. The reversal of 109195991 is 199591901.

It is a de Polignac number, because none of the positive numbers 2^k-109195991 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 (109195901) 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 15 ways as a sum of consecutive naturals, for example, 159536 + ... + 160218.

It is an arithmetic number, because the mean of its divisors is an integer number (7310250).

Almost surely, 2^109195991 is an apocalyptic number.

109195991 is a deficient number, since it is larger than the sum of its proper divisors (7768009).

109195991 is a wasteful number, since it uses less digits than its factorization.

109195991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898.

The product of its (nonzero) digits is 32805, while the sum is 44.

The square root of 109195991 is about 10449.6885599524. The cubic root of 109195991 is about 477.9717527352.

The spelling of 109195991 in words is "one hundred nine million, one hundred ninety-five thousand, nine hundred ninety-one".