138696559 has 2 divisors, whose sum is σ = 138696560. Its totient is φ = 138696558.

The previous prime is 138696529. The next prime is 138696581. The reversal of 138696559 is 955696831.

138696559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138696559 - 2⁵ = 138696527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138696529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69348279 + 69348280.

It is an arithmetic number, because the mean of its divisors is an integer number (69348280).

Almost surely, 2^138696559 is an apocalyptic number.

138696559 is a deficient number, since it is larger than the sum of its proper divisors (1).

138696559 is an equidigital number, since it uses as much as digits as its factorization.

138696559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 52.

The square root of 138696559 is about 11776.9503268036. The cubic root of 138696559 is about 517.6329284262.

The spelling of 138696559 in words is "one hundred thirty-eight million, six hundred ninety-six thousand, five hundred fifty-nine".