91010991100 has 36 divisors (see below), whose sum is σ = 197530497864. Its totient is φ = 36397641280.

The previous prime is 91010991041. The next prime is 91010991107. The reversal of 91010991100 is 119901019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91010991107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475647 + ... + 638953.

It is an arithmetic number, because the mean of its divisors is an integer number (5486958274).

Almost surely, 2^91010991100 is an apocalyptic number.

It is an amenable number.

91010991100 is an abundant number, since it is smaller than the sum of its proper divisors (106519506764).

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

91010991100 is a wasteful number, since it uses less digits than its factorization.

91010991100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168894 (or 168887 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 31.

The spelling of 91010991100 in words is "ninety-one billion, ten million, nine hundred ninety-one thousand, one hundred".