320440131 has 20 divisors (see below), whose sum is σ = 522200184. Its totient is φ = 194205600.

The previous prime is 320440129. The next prime is 320440147. The reversal of 320440131 is 131044023.

It is not a de Polignac number, because 320440131 - 2¹ = 320440129 is a prime.

It is a super-2 number, since 2×320440131² = 205363755110594322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (320440121) 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 19 ways as a sum of consecutive naturals, for example, 178930 + ... + 180711.

Almost surely, 2^320440131 is an apocalyptic number.

320440131 is a deficient number, since it is larger than the sum of its proper divisors (201760053).

320440131 is a wasteful number, since it uses less digits than its factorization.

320440131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359664 (or 359655 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 320440131 is about 17900.8416282587. The cubic root of 320440131 is about 684.3038239358.

Adding to 320440131 its reverse (131044023), we get a palindrome (451484154).

The spelling of 320440131 in words is "three hundred twenty million, four hundred forty thousand, one hundred thirty-one".