91111020192 has 288 divisors, whose sum is σ = 289514010240. Its totient is φ = 27030896640.

The previous prime is 91111020181. The next prime is 91111020223. The reversal of 91111020192 is 29102011119.

It is a tau number, because it is divible by the number of its divisors (288).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10017567 + ... + 10026657.

It is an arithmetic number, because the mean of its divisors is an integer number (1005256980).

Almost surely, 2^91111020192 is an apocalyptic number.

91111020192 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91111020192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144757005120).

91111020192 is an abundant number, since it is smaller than the sum of its proper divisors (198402990048).

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

91111020192 is a wasteful number, since it uses less digits than its factorization.

91111020192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9236 (or 9225 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The spelling of 91111020192 in words is "ninety-one billion, one hundred eleven million, twenty thousand, one hundred ninety-two".