991300 has 36 divisors (see below), whose sum is σ = 2249856. Its totient is φ = 378400.

The previous prime is 991273. The next prime is 991313. The reversal of 991300 is 3199.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2085 + ... + 2515.

It is an arithmetic number, because the mean of its divisors is an integer number (62496).

2⁹⁹¹³⁰⁰ 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 991300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124928).

991300 is an abundant number, since it is smaller than the sum of its proper divisors (1258556).

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

991300 is a wasteful number, since it uses less digits than its factorization.

991300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 991300 is about 995.6404973684. The cubic root of 991300 is about 99.7091549114.

Adding to 991300 its reverse (3199), we get a palindrome (994499).

The spelling of 991300 in words is "nine hundred ninety-one thousand, three hundred".