31321301173 has 2 divisors, whose sum is σ = 31321301174. Its totient is φ = 31321301172.

The previous prime is 31321301171. The next prime is 31321301243. The reversal of 31321301173 is 37110312313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30602953969 + 718347204 = 174937^2 + 26802^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321301173 - 2¹ = 31321301171 is a prime.

Together with 31321301171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321301171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660650586 + 15660650587.

It is an arithmetic number, because the mean of its divisors is an integer number (15660650587).

Almost surely, 2^31321301173 is an apocalyptic number.

It is an amenable number.

31321301173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321301173 is an equidigital number, since it uses as much as digits as its factorization.

31321301173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 25.

Adding to 31321301173 its reverse (37110312313), we get a palindrome (68431613486).

The spelling of 31321301173 in words is "thirty-one billion, three hundred twenty-one million, three hundred one thousand, one hundred seventy-three".