9109111091091 has 16 divisors (see below), whose sum is σ = 13677023106048. Its totient is φ = 5342587149600.

The previous prime is 9109111091071. The next prime is 9109111091149. The reversal of 9109111091091 is 1901901119019.

It is not a de Polignac number, because 9109111091091 - 2⁶ = 9109111091027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9109111091021) 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, 4452154936 + ... + 4452156981.

It is an arithmetic number, because the mean of its divisors is an integer number (854813944128).

Almost surely, 2^{9109111091091} is an apocalyptic number.

9109111091091 is a deficient number, since it is larger than the sum of its proper divisors (4567912014957).

9109111091091 is a wasteful number, since it uses less digits than its factorization.

9109111091091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8904311962.

The product of its (nonzero) digits is 6561, while the sum is 42.

It can be divided in two parts, 910911 and 1091091, that added together give a palindrome (2002002).

The spelling of 9109111091091 in words is "nine trillion, one hundred nine billion, one hundred eleven million, ninety-one thousand, ninety-one".