138611 has 4 divisors (see below), whose sum is σ = 151224. Its totient is φ = 126000.

The previous prime is 138599. The next prime is 138617. The reversal of 138611 is 116831.

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 138611 - 2⁶ = 138547 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138611.

It is not an unprimeable number, because it can be changed into a prime (138617) 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, 6290 + ... + 6311.

It is an arithmetic number, because the mean of its divisors is an integer number (37806).

2¹³⁸⁶¹¹ is an apocalyptic number.

138611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138611 is the 167-th centered decagonal number.

138611 is a deficient number, since it is larger than the sum of its proper divisors (12613).

138611 is a wasteful number, since it uses less digits than its factorization.

138611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12612.

The product of its digits is 144, while the sum is 20.

The square root of 138611 is about 372.3049825076. The cubic root of 138611 is about 51.7526467564.

The spelling of 138611 in words is "one hundred thirty-eight thousand, six hundred eleven".