138955159 has 4 divisors (see below), whose sum is σ = 158805904. Its totient is φ = 119104416.

The previous prime is 138955129. The next prime is 138955163. The reversal of 138955159 is 951559831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138955159 - 2¹⁷ = 138824087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138955129) 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 in 3 ways as a sum of consecutive naturals, for example, 9925362 + ... + 9925375.

It is an arithmetic number, because the mean of its divisors is an integer number (39701476).

Almost surely, 2^138955159 is an apocalyptic number.

138955159 is a deficient number, since it is larger than the sum of its proper divisors (19850745).

138955159 is an equidigital number, since it uses as much as digits as its factorization.

138955159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19850744.

The product of its digits is 243000, while the sum is 46.

The square root of 138955159 is about 11787.9242871678. The cubic root of 138955159 is about 517.9544378862.

The spelling of 138955159 in words is "one hundred thirty-eight million, nine hundred fifty-five thousand, one hundred fifty-nine".