31223909068813 has 2 divisors, whose sum is σ = 31223909068814. Its totient is φ = 31223909068812.

The previous prime is 31223909068811. The next prime is 31223909068829. The reversal of 31223909068813 is 31886090932213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28811161965609 + 2412747103204 = 5367603^2 + 1553302^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223909068813 - 2¹ = 31223909068811 is a prime.

Together with 31223909068811, 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 (31223909068811) 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, 15611954534406 + 15611954534407.

It is an arithmetic number, because the mean of its divisors is an integer number (15611954534407).

Almost surely, 2^{31223909068813} is an apocalyptic number.

It is an amenable number.

31223909068813 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223909068813 is an equidigital number, since it uses as much as digits as its factorization.

31223909068813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 31223909068813 in words is "thirty-one trillion, two hundred twenty-three billion, nine hundred nine million, sixty-eight thousand, eight hundred thirteen".