991104 has 64 divisors (see below), whose sum is σ = 2754000. Its totient is φ = 315392.

The previous prime is 991091. The next prime is 991127. The reversal of 991104 is 401199.

991104 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11092 + ... + 11180.

2⁹⁹¹¹⁰⁴ 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 991104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1377000).

991104 is an abundant number, since it is smaller than the sum of its proper divisors (1762896).

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

991104 is a wasteful number, since it uses less digits than its factorization.

991104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 991104 is about 995.5420634006. The cubic root of 991104 is about 99.7025829748.

The spelling of 991104 in words is "nine hundred ninety-one thousand, one hundred four".