138603539 has 2 divisors, whose sum is σ = 138603540. Its totient is φ = 138603538.

The previous prime is 138603523. The next prime is 138603547. The reversal of 138603539 is 935306831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138603539 - 2⁴ = 138603523 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_7837625 and since 138603539 and 7837625 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138603559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69301769 + 69301770.

It is an arithmetic number, because the mean of its divisors is an integer number (69301770).

Almost surely, 2^138603539 is an apocalyptic number.

138603539 is a deficient number, since it is larger than the sum of its proper divisors (1).

138603539 is an equidigital number, since it uses as much as digits as its factorization.

138603539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 138603539 is about 11773.0004247006. Note that the first 3 decimals coincide. The cubic root of 138603539 is about 517.5171817831.

The spelling of 138603539 in words is "one hundred thirty-eight million, six hundred three thousand, five hundred thirty-nine".