322991 has 4 divisors (see below), whose sum is σ = 325032. Its totient is φ = 320952.

The previous prime is 322969. The next prime is 322997. The reversal of 322991 is 199223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199223 = 17 ⋅11719.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-322991 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 322991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (322997) 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, 761 + ... + 1106.

It is an arithmetic number, because the mean of its divisors is an integer number (81258).

2³²²⁹⁹¹ is an apocalyptic number.

322991 is a deficient number, since it is larger than the sum of its proper divisors (2041).

322991 is a wasteful number, since it uses less digits than its factorization.

322991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

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

The square root of 322991 is about 568.3229715575. The cubic root of 322991 is about 68.6114830882.

The spelling of 322991 in words is "three hundred twenty-two thousand, nine hundred ninety-one".