31233122213 has 2 divisors, whose sum is σ = 31233122214. Its totient is φ = 31233122212.

The previous prime is 31233122161. The next prime is 31233122303. The reversal of 31233122213 is 31222133213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22273174564 + 8959947649 = 149242^2 + 94657^2 .

It is an emirp because it is prime and its reverse (31222133213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31233122213 - 2⁸ = 31233121957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31233122513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616561106 + 15616561107.

It is an arithmetic number, because the mean of its divisors is an integer number (15616561107).

Almost surely, 2^31233122213 is an apocalyptic number.

It is an amenable number.

31233122213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31233122213 is an equidigital number, since it uses as much as digits as its factorization.

31233122213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

Adding to 31233122213 its reverse (31222133213), we get a palindrome (62455255426).

The spelling of 31233122213 in words is "thirty-one billion, two hundred thirty-three million, one hundred twenty-two thousand, two hundred thirteen".