991716 has 36 divisors (see below), whose sum is σ = 2547216. Its totient is φ = 300080.

The previous prime is 991703. The next prime is 991717. The reversal of 991716 is 617199.

991716 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (991717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1111 + ... + 1793.

It is an arithmetic number, because the mean of its divisors is an integer number (70756).

2⁹⁹¹⁷¹⁶ 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 991716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273608).

991716 is an abundant number, since it is smaller than the sum of its proper divisors (1555500).

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

991716 is a wasteful number, since it uses less digits than its factorization.

991716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 699 counting only the distinct ones).

The product of its digits is 3402, while the sum is 33.

The square root of 991716 is about 995.8493862026. The cubic root of 991716 is about 99.7231006418.

The spelling of 991716 in words is "nine hundred ninety-one thousand, seven hundred sixteen".