991248 has 40 divisors (see below), whose sum is σ = 2598048. Its totient is φ = 325632.

The previous prime is 991229. The next prime is 991261. The reversal of 991248 is 842199.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991248.

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, 5040 + ... + 5232.

2⁹⁹¹²⁴⁸ 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 991248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1299024).

991248 is an abundant number, since it is smaller than the sum of its proper divisors (1606800).

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

991248 is a wasteful number, since it uses less digits than its factorization.

With its successor (991249) it forms an eRAP, since the sums of their prime factors are consecutive (311 and 312).

991248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 305 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 991248 is about 995.6143831826. The cubic root of 991248 is about 99.7074114208.

The spelling of 991248 in words is "nine hundred ninety-one thousand, two hundred forty-eight".