91112111111010 has 192 divisors, whose sum is σ = 243113143029120. Its totient is φ = 21835026048000.

The previous prime is 91112111111009. The next prime is 91112111111041. The reversal of 91112111111010 is 1011111121119.

91112111111010 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×91112111111010² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 235549846 + ... + 235936334.

It is an arithmetic number, because the mean of its divisors is an integer number (1266214286610).

Almost surely, 2^{91112111111010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91112111111010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121556571514560).

91112111111010 is an abundant number, since it is smaller than the sum of its proper divisors (152001031918110).

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

91112111111010 is a wasteful number, since it uses less digits than its factorization.

91112111111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387265 (or 387254 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 21.

Adding to 91112111111010 its reverse (1011111121119), we get a palindrome (92123222232129).

The spelling of 91112111111010 in words is "ninety-one trillion, one hundred twelve billion, one hundred eleven million, one hundred eleven thousand, ten".