31223344213 has 2 divisors, whose sum is σ = 31223344214. Its totient is φ = 31223344212.

The previous prime is 31223344133. The next prime is 31223344223. The reversal of 31223344213 is 31244332213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22622265649 + 8601078564 = 150407^2 + 92742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31223344213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31223344223) 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, 15611672106 + 15611672107.

It is an arithmetic number, because the mean of its divisors is an integer number (15611672107).

Almost surely, 2^31223344213 is an apocalyptic number.

It is an amenable number.

31223344213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223344213 is an equidigital number, since it uses as much as digits as its factorization.

31223344213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 28.

Adding to 31223344213 its reverse (31244332213), we get a palindrome (62467676426).

The spelling of 31223344213 in words is "thirty-one billion, two hundred twenty-three million, three hundred forty-four thousand, two hundred thirteen".