31816324213 has 2 divisors, whose sum is σ = 31816324214. Its totient is φ = 31816324212.

The previous prime is 31816324207. The next prime is 31816324219. The reversal of 31816324213 is 31242361813.

It is a balanced prime because it is at equal distance from previous prime (31816324207) and next prime (31816324219).

It can be written as a sum of positive squares in only one way, i.e., 26017044804 + 5799279409 = 161298^2 + 76153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31816324213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31816324219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15908162106 + 15908162107.

It is an arithmetic number, because the mean of its divisors is an integer number (15908162107).

Almost surely, 2^31816324213 is an apocalyptic number.

It is an amenable number.

31816324213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31816324213 is an equidigital number, since it uses as much as digits as its factorization.

31816324213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The spelling of 31816324213 in words is "thirty-one billion, eight hundred sixteen million, three hundred twenty-four thousand, two hundred thirteen".