91101009100 has 72 divisors (see below), whose sum is σ = 202920137280. Its totient is φ = 35487731520.

The previous prime is 91101009067. The next prime is 91101009157. The reversal of 91101009100 is 190010119.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 559147 + ... + 703453.

It is an arithmetic number, because the mean of its divisors is an integer number (2818335240).

Almost surely, 2^91101009100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91101009100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101460068640).

91101009100 is an abundant number, since it is smaller than the sum of its proper divisors (111819128180).

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

91101009100 is a wasteful number, since it uses less digits than its factorization.

91101009100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144487 (or 144480 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 22.

Adding to 91101009100 its reverse (190010119), we get a palindrome (91291019219).

The spelling of 91101009100 in words is "ninety-one billion, one hundred one million, nine thousand, one hundred".