31133113213 has 2 divisors, whose sum is σ = 31133113214. Its totient is φ = 31133113212.

The previous prime is 31133113189. The next prime is 31133113247. The reversal of 31133113213 is 31231133113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18090788004 + 13042325209 = 134502^2 + 114203^2 .

It is a cyclic number.

It is not a de Polignac number, because 31133113213 - 2¹⁷ = 31132982141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31133113813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566556606 + 15566556607.

It is an arithmetic number, because the mean of its divisors is an integer number (15566556607).

Almost surely, 2^31133113213 is an apocalyptic number.

It is an amenable number.

31133113213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31133113213 is an equidigital number, since it uses as much as digits as its factorization.

31133113213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 22.

Adding to 31133113213 its reverse (31231133113), we get a palindrome (62364246326).

The spelling of 31133113213 in words is "thirty-one billion, one hundred thirty-three million, one hundred thirteen thousand, two hundred thirteen".