138571 has 2 divisors, whose sum is σ = 138572. Its totient is φ = 138570.

The previous prime is 138569. The next prime is 138577. The reversal of 138571 is 175831.

138571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138571 - 2¹ = 138569 is a prime.

Together with 138569, it forms a pair of twin primes.

138571 is a lucky number.

It is a plaindrome in base 7.

It is not a weakly prime, because it can be changed into another prime (138577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69285 + 69286.

It is an arithmetic number, because the mean of its divisors is an integer number (69286).

2¹³⁸⁵⁷¹ is an apocalyptic number.

138571 is a deficient number, since it is larger than the sum of its proper divisors (1).

138571 is an equidigital number, since it uses as much as digits as its factorization.

138571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 25.

The square root of 138571 is about 372.2512592323. The cubic root of 138571 is about 51.7476680630.

Subtracting from 138571 its product of digits (840), we obtain a palindrome (137731).

The spelling of 138571 in words is "one hundred thirty-eight thousand, five hundred seventy-one".