138068969 has 2 divisors, whose sum is σ = 138068970. Its totient is φ = 138068968.

The previous prime is 138068933. The next prime is 138069013. The reversal of 138068969 is 969860831.

138068969 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., 133171600 + 4897369 = 11540^2 + 2213^2 .

It is an emirp because it is prime and its reverse (969860831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138068969 is a prime.

It is a super-2 number, since 2×138068969² = 38126080401445922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138068929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69034484 + 69034485.

It is an arithmetic number, because the mean of its divisors is an integer number (69034485).

Almost surely, 2^138068969 is an apocalyptic number.

It is an amenable number.

138068969 is a deficient number, since it is larger than the sum of its proper divisors (1).

138068969 is an equidigital number, since it uses as much as digits as its factorization.

138068969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 138068969 is about 11750.2752733713. The cubic root of 138068969 is about 516.8509996912.

The spelling of 138068969 in words is "one hundred thirty-eight million, sixty-eight thousand, nine hundred sixty-nine".