31473332321 has 2 divisors, whose sum is σ = 31473332322. Its totient is φ = 31473332320.

The previous prime is 31473332257. The next prime is 31473332333. The reversal of 31473332321 is 12323337413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18491920225 + 12981412096 = 135985^2 + 113936^2 .

It is an emirp because it is prime and its reverse (12323337413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31473332321 - 2⁶ = 31473332257 is a prime.

It is not a weakly prime, because it can be changed into another prime (31473332621) 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, 15736666160 + 15736666161.

It is an arithmetic number, because the mean of its divisors is an integer number (15736666161).

Almost surely, 2^31473332321 is an apocalyptic number.

It is an amenable number.

31473332321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31473332321 is an equidigital number, since it uses as much as digits as its factorization.

31473332321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 32.

Adding to 31473332321 its reverse (12323337413), we get a palindrome (43796669734).

The spelling of 31473332321 in words is "thirty-one billion, four hundred seventy-three million, three hundred thirty-two thousand, three hundred twenty-one".