31122442213 has 2 divisors, whose sum is σ = 31122442214. Its totient is φ = 31122442212.

The previous prime is 31122442193. The next prime is 31122442271. The reversal of 31122442213 is 31224422113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30983744484 + 138697729 = 176022^2 + 11777^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31122442213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31122442613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561221106 + 15561221107.

It is an arithmetic number, because the mean of its divisors is an integer number (15561221107).

Almost surely, 2^31122442213 is an apocalyptic number.

It is an amenable number.

31122442213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31122442213 is an equidigital number, since it uses as much as digits as its factorization.

31122442213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 25.

Adding to 31122442213 its reverse (31224422113), we get a palindrome (62346864326).

The spelling of 31122442213 in words is "thirty-one billion, one hundred twenty-two million, four hundred forty-two thousand, two hundred thirteen".