138320197 has 2 divisors, whose sum is σ = 138320198. Its totient is φ = 138320196.

The previous prime is 138320167. The next prime is 138320213. The reversal of 138320197 is 791023831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75498721 + 62821476 = 8689^2 + 7926^2 .

It is a cyclic number.

It is not a de Polignac number, because 138320197 - 2²³ = 129931589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138320167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69160098 + 69160099.

It is an arithmetic number, because the mean of its divisors is an integer number (69160099).

Almost surely, 2^138320197 is an apocalyptic number.

It is an amenable number.

138320197 is a deficient number, since it is larger than the sum of its proper divisors (1).

138320197 is an equidigital number, since it uses as much as digits as its factorization.

138320197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 138320197 is about 11760.9607175604. The cubic root of 138320197 is about 517.1642942409.

The spelling of 138320197 in words is "one hundred thirty-eight million, three hundred twenty thousand, one hundred ninety-seven".