31310122213 has 2 divisors, whose sum is σ = 31310122214. Its totient is φ = 31310122212.

The previous prime is 31310122201. The next prime is 31310122243. The reversal of 31310122213 is 31222101313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29123811649 + 2186310564 = 170657^2 + 46758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31310122213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31310122243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655061106 + 15655061107.

It is an arithmetic number, because the mean of its divisors is an integer number (15655061107).

Almost surely, 2^31310122213 is an apocalyptic number.

It is an amenable number.

31310122213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310122213 is an equidigital number, since it uses as much as digits as its factorization.

31310122213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31310122213 its reverse (31222101313), we get a palindrome (62532223526).

The spelling of 31310122213 in words is "thirty-one billion, three hundred ten million, one hundred twenty-two thousand, two hundred thirteen".