31123232303173 has 2 divisors, whose sum is σ = 31123232303174. Its totient is φ = 31123232303172.

The previous prime is 31123232303153. The next prime is 31123232303329. The reversal of 31123232303173 is 37130323232113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24774530669604 + 6348701633569 = 4977402^2 + 2519663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31123232303173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123232303113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561616151586 + 15561616151587.

It is an arithmetic number, because the mean of its divisors is an integer number (15561616151587).

Almost surely, 2^{31123232303173} is an apocalyptic number.

It is an amenable number.

31123232303173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123232303173 is an equidigital number, since it uses as much as digits as its factorization.

31123232303173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 34.

Adding to 31123232303173 its reverse (37130323232113), we get a palindrome (68253555535286).

The spelling of 31123232303173 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred thirty-two million, three hundred three thousand, one hundred seventy-three".