31233001220173 has 2 divisors, whose sum is σ = 31233001220174. Its totient is φ = 31233001220172.

The previous prime is 31233001220167. The next prime is 31233001220203. The reversal of 31233001220173 is 37102210033213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21475605735684 + 9757395484489 = 4634178^2 + 3123683^2 .

It is a cyclic number.

It is not a de Polignac number, because 31233001220173 - 2³⁷ = 31095562266701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31233001220273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616500610086 + 15616500610087.

It is an arithmetic number, because the mean of its divisors is an integer number (15616500610087).

Almost surely, 2^{31233001220173} is an apocalyptic number.

It is an amenable number.

31233001220173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31233001220173 is an equidigital number, since it uses as much as digits as its factorization.

31233001220173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

Adding to 31233001220173 its reverse (37102210033213), we get a palindrome (68335211253386).

The spelling of 31233001220173 in words is "thirty-one trillion, two hundred thirty-three billion, one million, two hundred twenty thousand, one hundred seventy-three".