138320213 has 2 divisors, whose sum is σ = 138320214. Its totient is φ = 138320212.

The previous prime is 138320197. The next prime is 138320251. The reversal of 138320213 is 312023831.

138320213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115068529 + 23251684 = 10727^2 + 4822^2 .

It is a cyclic number.

It is not a de Polignac number, because 138320213 - 2⁴ = 138320197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138320713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69160106 + 69160107.

It is an arithmetic number, because the mean of its divisors is an integer number (69160107).

Almost surely, 2^138320213 is an apocalyptic number.

It is an amenable number.

138320213 is a deficient number, since it is larger than the sum of its proper divisors (1).

138320213 is an equidigital number, since it uses as much as digits as its factorization.

138320213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 138320213 is about 11760.9613977770. The cubic root of 138320213 is about 517.1643141816.

The spelling of 138320213 in words is "one hundred thirty-eight million, three hundred twenty thousand, two hundred thirteen".