138161081 has 2 divisors, whose sum is σ = 138161082. Its totient is φ = 138161080.

The previous prime is 138161047. The next prime is 138161113. The reversal of 138161081 is 180161831.

138161081 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., 91853056 + 46308025 = 9584^2 + 6805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138161081 is a prime.

It is a super-2 number, since 2×138161081² = 38176968606177122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138161011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69080540 + 69080541.

It is an arithmetic number, because the mean of its divisors is an integer number (69080541).

Almost surely, 2^138161081 is an apocalyptic number.

It is an amenable number.

138161081 is a deficient number, since it is larger than the sum of its proper divisors (1).

138161081 is an equidigital number, since it uses as much as digits as its factorization.

138161081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 138161081 is about 11754.1941876081. The cubic root of 138161081 is about 516.9659122994.

The spelling of 138161081 in words is "one hundred thirty-eight million, one hundred sixty-one thousand, eighty-one".