320971 has 4 divisors (see below), whose sum is σ = 366832. Its totient is φ = 275112.

The previous prime is 320953. The next prime is 321007. The reversal of 320971 is 179023.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 320971 - 2⁵ = 320939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22920 + ... + 22933.

It is an arithmetic number, because the mean of its divisors is an integer number (91708).

2³²⁰⁹⁷¹ is an apocalyptic number.

320971 is a deficient number, since it is larger than the sum of its proper divisors (45861).

320971 is an equidigital number, since it uses as much as digits as its factorization.

320971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45860.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 320971 is about 566.5430257271. The cubic root of 320971 is about 68.4681507861.

Adding to 320971 its reverse (179023), we get a palindrome (499994).

The spelling of 320971 in words is "three hundred twenty thousand, nine hundred seventy-one".