320631005 has 16 divisors (see below), whose sum is σ = 394377984. Its totient is φ = 250111680.

The previous prime is 320631001. The next prime is 320631007. The reversal of 320631005 is 500136023.

It is not a de Polignac number, because 320631005 - 2² = 320631001 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 (320631001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195047 + ... + 196683.

It is an arithmetic number, because the mean of its divisors is an integer number (24648624).

Almost surely, 2^320631005 is an apocalyptic number.

It is an amenable number.

320631005 is a deficient number, since it is larger than the sum of its proper divisors (73746979).

320631005 is a wasteful number, since it uses less digits than its factorization.

320631005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 320631005 is about 17906.1722598661. The cubic root of 320631005 is about 684.4396682218.

Adding to 320631005 its reverse (500136023), we get a palindrome (820767028).

The spelling of 320631005 in words is "three hundred twenty million, six hundred thirty-one thousand, five".