320004491 has 4 divisors (see below), whose sum is σ = 320075184. Its totient is φ = 319933800.

The previous prime is 320004439. The next prime is 320004523. The reversal of 320004491 is 194400023.

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 320004491 - 2⁶ = 320004427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320004401) 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, 28055 + ... + 37776.

It is an arithmetic number, because the mean of its divisors is an integer number (80018796).

Almost surely, 2^320004491 is an apocalyptic number.

320004491 is a deficient number, since it is larger than the sum of its proper divisors (70693).

320004491 is an equidigital number, since it uses as much as digits as its factorization.

320004491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70692.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 320004491 is about 17888.6693468240. The cubic root of 320004491 is about 683.9935784482.

The spelling of 320004491 in words is "three hundred twenty million, four thousand, four hundred ninety-one".