138197 has 2 divisors, whose sum is σ = 138198. Its totient is φ = 138196.

The previous prime is 138191. The next prime is 138209. The reversal of 138197 is 791831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98596 + 39601 = 314^2 + 199^2 .

It is a cyclic number.

It is not a de Polignac number, because 138197 - 2⁴ = 138181 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69098 + 69099.

It is an arithmetic number, because the mean of its divisors is an integer number (69099).

2¹³⁸¹⁹⁷ is an apocalyptic number.

It is an amenable number.

138197 is a deficient number, since it is larger than the sum of its proper divisors (1).

138197 is an equidigital number, since it uses as much as digits as its factorization.

138197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 138197 is about 371.7485709455. The cubic root of 138197 is about 51.7010708537.

The spelling of 138197 in words is "one hundred thirty-eight thousand, one hundred ninety-seven".