8138320213 has 2 divisors, whose sum is σ = 8138320214. Its totient is φ = 8138320212.

The previous prime is 8138320171. The next prime is 8138320219. The reversal of 8138320213 is 3120238318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7776065124 + 362255089 = 88182^2 + 19033^2 .

It is a cyclic number.

It is not a de Polignac number, because 8138320213 - 2¹⁷ = 8138189141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8138320219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069160106 + 4069160107.

It is an arithmetic number, because the mean of its divisors is an integer number (4069160107).

Almost surely, 2^8138320213 is an apocalyptic number.

It is an amenable number.

8138320213 is a deficient number, since it is larger than the sum of its proper divisors (1).

8138320213 is an equidigital number, since it uses as much as digits as its factorization.

8138320213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 8138320213 is about 90212.6388761575. The cubic root of 8138320213 is about 2011.4608830459.

The spelling of 8138320213 in words is "eight billion, one hundred thirty-eight million, three hundred twenty thousand, two hundred thirteen".