91111098 has 64 divisors (see below), whose sum is σ = 207567360. Its totient is φ = 26460672.

The previous prime is 91111093. The next prime is 91111123. The reversal of 91111098 is 89011119.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91111091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105886 + ... + 106742.

It is an arithmetic number, because the mean of its divisors is an integer number (3243240).

Almost surely, 2^91111098 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91111098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103783680).

91111098 is an abundant number, since it is smaller than the sum of its proper divisors (116456262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91111098 is a wasteful number, since it uses less digits than its factorization.

91111098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951.

The product of its (nonzero) digits is 648, while the sum is 30.

The square root of 91111098 is about 9545.2133553944. The cubic root of 91111098 is about 449.9771148856.

The spelling of 91111098 in words is "ninety-one million, one hundred eleven thousand, ninety-eight".