991322 has 8 divisors (see below), whose sum is σ = 1521696. Its totient is φ = 484092.

The previous prime is 991313. The next prime is 991327. The reversal of 991322 is 223199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 991291 and 991300.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991322.

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

991322 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5678 + ... + 5849.

It is an arithmetic number, because the mean of its divisors is an integer number (190212).

2⁹⁹¹³²² is an apocalyptic number.

991322 is a deficient number, since it is larger than the sum of its proper divisors (530374).

991322 is a wasteful number, since it uses less digits than its factorization.

991322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11572.

The product of its digits is 972, while the sum is 26.

The square root of 991322 is about 995.6515454716. The cubic root of 991322 is about 99.7098925237.

The spelling of 991322 in words is "nine hundred ninety-one thousand, three hundred twenty-two".