320565139 has 4 divisors (see below), whose sum is σ = 320712856. Its totient is φ = 320417424.

The previous prime is 320565127. The next prime is 320565143. The reversal of 320565139 is 931565023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931565023 = 269 ⋅3463067.

It is a cyclic number.

It is not a de Polignac number, because 320565139 - 2¹¹ = 320563091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320565199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70554 + ... + 74959.

It is an arithmetic number, because the mean of its divisors is an integer number (80178214).

Almost surely, 2^320565139 is an apocalyptic number.

320565139 is a deficient number, since it is larger than the sum of its proper divisors (147717).

320565139 is a wasteful number, since it uses less digits than its factorization.

320565139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147716.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 320565139 is about 17904.3329671898. The cubic root of 320565139 is about 684.3927977385.

The spelling of 320565139 in words is "three hundred twenty million, five hundred sixty-five thousand, one hundred thirty-nine".