138078533 has 2 divisors, whose sum is σ = 138078534. Its totient is φ = 138078532.

The previous prime is 138078503. The next prime is 138078553. The reversal of 138078533 is 335870831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104182849 + 33895684 = 10207^2 + 5822^2 .

It is a cyclic number.

It is not a de Polignac number, because 138078533 - 2⁸ = 138078277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138078503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69039266 + 69039267.

It is an arithmetic number, because the mean of its divisors is an integer number (69039267).

Almost surely, 2^138078533 is an apocalyptic number.

It is an amenable number.

138078533 is a deficient number, since it is larger than the sum of its proper divisors (1).

138078533 is an equidigital number, since it uses as much as digits as its factorization.

138078533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 138078533 is about 11750.6822355130. The cubic root of 138078533 is about 516.8629334585.

The spelling of 138078533 in words is "one hundred thirty-eight million, seventy-eight thousand, five hundred thirty-three".