320131020173 has 2 divisors, whose sum is σ = 320131020174. Its totient is φ = 320131020172.

The previous prime is 320131020163. The next prime is 320131020191. The reversal of 320131020173 is 371020131023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284812207684 + 35318812489 = 533678^2 + 187933^2 .

It is a cyclic number.

It is not a de Polignac number, because 320131020173 - 2²⁶ = 320063911309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320131020113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160065510086 + 160065510087.

It is an arithmetic number, because the mean of its divisors is an integer number (160065510087).

Almost surely, 2^320131020173 is an apocalyptic number.

It is an amenable number.

320131020173 is a deficient number, since it is larger than the sum of its proper divisors (1).

320131020173 is an equidigital number, since it uses as much as digits as its factorization.

320131020173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 320131020173 its reverse (371020131023), we get a palindrome (691151151196).

The spelling of 320131020173 in words is "three hundred twenty billion, one hundred thirty-one million, twenty thousand, one hundred seventy-three".