138631559 has 8 divisors (see below), whose sum is σ = 151996800. Its totient is φ = 125393400.

The previous prime is 138631553. The next prime is 138631573. The reversal of 138631559 is 955136831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138631559 - 2⁸ = 138631303 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 (138631553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29477 + ... + 33854.

It is an arithmetic number, because the mean of its divisors is an integer number (18999600).

Almost surely, 2^138631559 is an apocalyptic number.

138631559 is a deficient number, since it is larger than the sum of its proper divisors (13365241).

138631559 is a wasteful number, since it uses less digits than its factorization.

138631559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63541.

The product of its digits is 97200, while the sum is 41.

The square root of 138631559 is about 11774.1903755630. The cubic root of 138631559 is about 517.5520530773.

The spelling of 138631559 in words is "one hundred thirty-eight million, six hundred thirty-one thousand, five hundred fifty-nine".