9109191920111 has 4 divisors (see below), whose sum is σ = 9199381939224. Its totient is φ = 9019001901000.

The previous prime is 9109191920077. The next prime is 9109191920197. The reversal of 9109191920111 is 1110291919019.

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 9109191920111 - 2¹⁴ = 9109191903727 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 (9109191922111) 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, 45095009405 + ... + 45095009606.

It is an arithmetic number, because the mean of its divisors is an integer number (2299845484806).

Almost surely, 2^{9109191920111} is an apocalyptic number.

9109191920111 is a deficient number, since it is larger than the sum of its proper divisors (90190019113).

9109191920111 is a wasteful number, since it uses less digits than its factorization.

9109191920111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90190019112.

The product of its (nonzero) digits is 13122, while the sum is 44.

The spelling of 9109191920111 in words is "nine trillion, one hundred nine billion, one hundred ninety-one million, nine hundred twenty thousand, one hundred eleven".