320540331 has 4 divisors (see below), whose sum is σ = 427387112. Its totient is φ = 213693552.

The previous prime is 320540327. The next prime is 320540357. The reversal of 320540331 is 133045023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133045023 = 3 ⋅44348341.

It is not a de Polignac number, because 320540331 - 2² = 320540327 is a prime.

It is a super-2 number, since 2×320540331² = 205492207595179122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320540298 and 320540307.

It is not an unprimeable number, because it can be changed into a prime (320540371) 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, 53423386 + ... + 53423391.

It is an arithmetic number, because the mean of its divisors is an integer number (106846778).

Almost surely, 2^320540331 is an apocalyptic number.

320540331 is a deficient number, since it is larger than the sum of its proper divisors (106846781).

320540331 is a wasteful number, since it uses less digits than its factorization.

320540331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106846780.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 320540331 is about 17903.6401605930. The cubic root of 320540331 is about 684.3751426117.

Adding to 320540331 its reverse (133045023), we get a palindrome (453585354).

The spelling of 320540331 in words is "three hundred twenty million, five hundred forty thousand, three hundred thirty-one".