320043013 has 4 divisors (see below), whose sum is σ = 320083180. Its totient is φ = 320002848.

The previous prime is 320042993. The next prime is 320043029. The reversal of 320043013 is 310340023.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 310340023 = 7 ⋅44334289.

It can be written as a sum of positive squares in 2 ways, for example, as 166332609 + 153710404 = 12897^2 + 12398^2 .

It is a cyclic number.

It is not a de Polignac number, because 320043013 - 2¹⁷ = 319911941 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 (320043083) 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, 3648 + ... + 25561.

It is an arithmetic number, because the mean of its divisors is an integer number (80020795).

Almost surely, 2^320043013 is an apocalyptic number.

It is an amenable number.

320043013 is a deficient number, since it is larger than the sum of its proper divisors (40167).

320043013 is a wasteful number, since it uses less digits than its factorization.

320043013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40166.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 320043013 is about 17889.7460294997. The cubic root of 320043013 is about 684.0210236291.

Adding to 320043013 its reverse (310340023), we get a palindrome (630383036).

The spelling of 320043013 in words is "three hundred twenty million, forty-three thousand, thirteen".