138070649 has 2 divisors, whose sum is σ = 138070650. Its totient is φ = 138070648.

The previous prime is 138070637. The next prime is 138070697. The reversal of 138070649 is 946070831.

138070649 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., 137827600 + 243049 = 11740^2 + 493^2 .

It is an emirp because it is prime and its reverse (946070831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138070649 - 2⁸ = 138070393 is a prime.

It is not a weakly prime, because it can be changed into another prime (138070609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69035324 + 69035325.

It is an arithmetic number, because the mean of its divisors is an integer number (69035325).

Almost surely, 2^138070649 is an apocalyptic number.

It is an amenable number.

138070649 is a deficient number, since it is larger than the sum of its proper divisors (1).

138070649 is an equidigital number, since it uses as much as digits as its factorization.

138070649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 138070649 is about 11750.3467608407. The cubic root of 138070649 is about 516.8530960014.

The spelling of 138070649 in words is "one hundred thirty-eight million, seventy thousand, six hundred forty-nine".