31203320145205 has 12 divisors (see below), whose sum is σ = 40545852686820. Its totient is φ = 23042451798912.

The previous prime is 31203320145203. The next prime is 31203320145211. The reversal of 31203320145205 is 50254102330213.

It can be written as a sum of positive squares in 6 ways, for example, as 10230638940369 + 20972681204836 = 3198537^2 + 4579594^2 .

It is not a de Polignac number, because 31203320145205 - 2¹ = 31203320145203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203320145203) 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 in 11 ways as a sum of consecutive naturals, for example, 18463502200 + ... + 18463503889.

It is an arithmetic number, because the mean of its divisors is an integer number (3378821057235).

Almost surely, 2^{31203320145205} is an apocalyptic number.

It is an amenable number.

31203320145205 is a deficient number, since it is larger than the sum of its proper divisors (9342532541615).

31203320145205 is a wasteful number, since it uses less digits than its factorization.

31203320145205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36927006120 (or 36927006107 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 31203320145205 its reverse (50254102330213), we get a palindrome (81457422475418).

The spelling of 31203320145205 in words is "thirty-one trillion, two hundred three billion, three hundred twenty million, one hundred forty-five thousand, two hundred five".