9181819111091 has 24 divisors (see below), whose sum is σ = 10422567480192. Its totient is φ = 8074285401600.

The previous prime is 9181819111081. The next prime is 9181819111109. The reversal of 9181819111091 is 1901119181819.

It is not a de Polignac number, because 9181819111091 - 2¹⁸ = 9181818848947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9181819111081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7987565 + ... + 9064481.

It is an arithmetic number, because the mean of its divisors is an integer number (434273645008).

Almost surely, 2^{9181819111091} is an apocalyptic number.

9181819111091 is a deficient number, since it is larger than the sum of its proper divisors (1240748369101).

9181819111091 is a wasteful number, since it uses less digits than its factorization.

9181819111091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079243 (or 1079232 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 50.

The spelling of 9181819111091 in words is "nine trillion, one hundred eighty-one billion, eight hundred nineteen million, one hundred eleven thousand, ninety-one".