991548 has 24 divisors (see below), whose sum is σ = 2570960. Its totient is φ = 330480.

The previous prime is 991547. The next prime is 991567. The reversal of 991548 is 845199.

991548 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 (36).

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 991548.

It is not an unprimeable number, because it can be changed into a prime (991541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4483 + ... + 4698.

2⁹⁹¹⁵⁴⁸ is an apocalyptic number.

It is an amenable number.

991548 is an abundant number, since it is smaller than the sum of its proper divisors (1579412).

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

991548 is a wasteful number, since it uses less digits than its factorization.

991548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9194 (or 9186 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 991548 is about 995.7650325252. The cubic root of 991548 is about 99.7174691818.

The spelling of 991548 in words is "nine hundred ninety-one thousand, five hundred forty-eight".