138856271 has 4 divisors (see below), whose sum is σ = 138893832. Its totient is φ = 138818712.

The previous prime is 138856259. The next prime is 138856297. The reversal of 138856271 is 172658831.

138856271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138856271 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 (138856241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12545 + ... + 20858.

It is an arithmetic number, because the mean of its divisors is an integer number (34723458).

Almost surely, 2^138856271 is an apocalyptic number.

138856271 is a deficient number, since it is larger than the sum of its proper divisors (37561).

138856271 is an equidigital number, since it uses as much as digits as its factorization.

138856271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37560.

The product of its digits is 80640, while the sum is 41.

The square root of 138856271 is about 11783.7290786915. The cubic root of 138856271 is about 517.8315406057.

The spelling of 138856271 in words is "one hundred thirty-eight million, eight hundred fifty-six thousand, two hundred seventy-one".