138009527 has 2 divisors, whose sum is σ = 138009528. Its totient is φ = 138009526.

The previous prime is 138009491. The next prime is 138009577. The reversal of 138009527 is 725900831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138009527 - 2²² = 133815223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138009577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69004763 + 69004764.

It is an arithmetic number, because the mean of its divisors is an integer number (69004764).

Almost surely, 2^138009527 is an apocalyptic number.

138009527 is a deficient number, since it is larger than the sum of its proper divisors (1).

138009527 is an equidigital number, since it uses as much as digits as its factorization.

138009527 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 138009527 is about 11747.7456135209. The cubic root of 138009527 is about 516.7768167971.

The spelling of 138009527 in words is "one hundred thirty-eight million, nine thousand, five hundred twenty-seven".