138511 has 2 divisors, whose sum is σ = 138512. Its totient is φ = 138510.

The previous prime is 138497. The next prime is 138517. The reversal of 138511 is 115831.

138511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (115831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138511 - 2⁹ = 137999 is a prime.

It is a Chen prime.

138511 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69255 + 69256.

It is an arithmetic number, because the mean of its divisors is an integer number (69256).

2¹³⁸⁵¹¹ is an apocalyptic number.

138511 is a deficient number, since it is larger than the sum of its proper divisors (1).

138511 is an equidigital number, since it uses as much as digits as its factorization.

138511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 19.

The square root of 138511 is about 372.1706597785. The cubic root of 138511 is about 51.7401982261.

The spelling of 138511 in words is "one hundred thirty-eight thousand, five hundred eleven".