138761197 has 2 divisors, whose sum is σ = 138761198. Its totient is φ = 138761196.

The previous prime is 138761171. The next prime is 138761213. The reversal of 138761197 is 791167831.

It is a happy number.

138761197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137851081 + 910116 = 11741^2 + 954^2 .

It is a cyclic number.

It is not a de Polignac number, because 138761197 - 2¹¹ = 138759149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138771197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69380598 + 69380599.

It is an arithmetic number, because the mean of its divisors is an integer number (69380599).

Almost surely, 2^138761197 is an apocalyptic number.

It is an amenable number.

138761197 is a deficient number, since it is larger than the sum of its proper divisors (1).

138761197 is an equidigital number, since it uses as much as digits as its factorization.

138761197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 43.

The square root of 138761197 is about 11779.6942659816. The cubic root of 138761197 is about 517.7133283081.

The spelling of 138761197 in words is "one hundred thirty-eight million, seven hundred sixty-one thousand, one hundred ninety-seven".