320191 has 4 divisors (see below), whose sum is σ = 322000. Its totient is φ = 318384.

The previous prime is 320179. The next prime is 320209. The reversal of 320191 is 191023.

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 320191 - 2⁷ = 320063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320101) 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, 606 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (80500).

2³²⁰¹⁹¹ is an apocalyptic number.

320191 is a deficient number, since it is larger than the sum of its proper divisors (1809).

320191 is a wasteful number, since it uses less digits than its factorization.

320191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 320191 is about 565.8542215094. The cubic root of 320191 is about 68.4126437190.

The spelling of 320191 in words is "three hundred twenty thousand, one hundred ninety-one".