320491 has 4 divisors (see below), whose sum is σ = 326592. Its totient is φ = 314392.

The previous prime is 320483. The next prime is 320513. The reversal of 320491 is 194023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194023 = 251 ⋅773.

It is a cyclic number.

It is not a de Polignac number, because 320491 - 2³ = 320483 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (320401) 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, 2971 + ... + 3076.

It is an arithmetic number, because the mean of its divisors is an integer number (81648).

2³²⁰⁴⁹¹ is an apocalyptic number.

320491 is a deficient number, since it is larger than the sum of its proper divisors (6101).

320491 is an equidigital number, since it uses as much as digits as its factorization.

320491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6100.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 320491 is about 566.1192453892. The cubic root of 320491 is about 68.4340032477.

The spelling of 320491 in words is "three hundred twenty thousand, four hundred ninety-one".