320430813 has 4 divisors (see below), whose sum is σ = 427241088. Its totient is φ = 213620540.

The previous prime is 320430793. The next prime is 320430827. The reversal of 320430813 is 318034023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 318034023 = 3 ⋅106011341.

It is a cyclic number.

It is not a de Polignac number, because 320430813 - 2¹⁰ = 320429789 is a prime.

It is a super-3 number, since 3×320430813³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320430853) 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, 53405133 + ... + 53405138.

It is an arithmetic number, because the mean of its divisors is an integer number (106810272).

Almost surely, 2^320430813 is an apocalyptic number.

It is an amenable number.

320430813 is a deficient number, since it is larger than the sum of its proper divisors (106810275).

320430813 is a wasteful number, since it uses less digits than its factorization.

320430813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106810274.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 320430813 is about 17900.5813592743. The cubic root of 320430813 is about 684.2971909705.

Adding to 320430813 its reverse (318034023), we get a palindrome (638464836).

The spelling of 320430813 in words is "three hundred twenty million, four hundred thirty thousand, eight hundred thirteen".