991148 has 12 divisors (see below), whose sum is σ = 1747200. Its totient is φ = 491952.

The previous prime is 991147. The next prime is 991171. The reversal of 991148 is 841199.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (991147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236 + ... + 1427.

It is an arithmetic number, because the mean of its divisors is an integer number (145600).

2⁹⁹¹¹⁴⁸ is an apocalyptic number.

It is an amenable number.

991148 is a deficient number, since it is larger than the sum of its proper divisors (756052).

991148 is a wasteful number, since it uses less digits than its factorization.

991148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816 (or 1814 counting only the distinct ones).

The product of its digits is 2592, while the sum is 32.

The square root of 991148 is about 995.5641616692. The cubic root of 991148 is about 99.7040583829.

The spelling of 991148 in words is "nine hundred ninety-one thousand, one hundred forty-eight".