138541 has 4 divisors (see below), whose sum is σ = 149212. Its totient is φ = 127872.

The previous prime is 138517. The next prime is 138547. The reversal of 138541 is 145831.

138541 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 can be written as a sum of positive squares in 2 ways, for example, as 13225 + 125316 = 115^2 + 354^2 .

It is a cyclic number.

It is not a de Polignac number, because 138541 - 2¹³ = 130349 is a prime.

It is a Duffinian number.

138541 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138547) 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, 5316 + ... + 5341.

It is an arithmetic number, because the mean of its divisors is an integer number (37303).

2¹³⁸⁵⁴¹ is an apocalyptic number.

It is an amenable number.

138541 is a deficient number, since it is larger than the sum of its proper divisors (10671).

138541 is a wasteful number, since it uses less digits than its factorization.

138541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10670.

The product of its digits is 480, while the sum is 22.

The square root of 138541 is about 372.2109616871. The cubic root of 138541 is about 51.7439334141.

The spelling of 138541 in words is "one hundred thirty-eight thousand, five hundred forty-one".