991324 has 12 divisors (see below), whose sum is σ = 1772064. Its totient is φ = 485024.

The previous prime is 991313. The next prime is 991327. The reversal of 991324 is 423199.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 991292 and 991301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2449 + ... + 2824.

It is an arithmetic number, because the mean of its divisors is an integer number (147672).

2⁹⁹¹³²⁴ is an apocalyptic number.

991324 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

It is an amenable number.

991324 is a deficient number, since it is larger than the sum of its proper divisors (780740).

991324 is a wasteful number, since it uses less digits than its factorization.

991324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324 (or 5322 counting only the distinct ones).

The product of its digits is 1944, while the sum is 28.

The square root of 991324 is about 995.6525498385. The cubic root of 991324 is about 99.7099595788.

The spelling of 991324 in words is "nine hundred ninety-one thousand, three hundred twenty-four".