91099900 has 36 divisors (see below), whose sum is σ = 200652088. Its totient is φ = 35893440.

The previous prime is 91099891. The next prime is 91099913. The reversal of 91099900 is 999019.

It is a self number, because there is not a number n which added to its sum of digits gives 91099900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99 + ... + 13498.

Almost surely, 2^91099900 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 91099900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100326044).

91099900 is an abundant number, since it is smaller than the sum of its proper divisors (109552188).

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

91099900 is a wasteful number, since it uses less digits than its factorization.

91099900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13678 (or 13671 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 91099900 is about 9544.6267606439. The cubic root of 91099900 is about 449.9586793335.

The spelling of 91099900 in words is "ninety-one million, ninety-nine thousand, nine hundred".