135391 has 2 divisors, whose sum is σ = 135392. Its totient is φ = 135390.

The previous prime is 135389. The next prime is 135403. The reversal of 135391 is 193531.

135391 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 135391 - 2¹ = 135389 is a prime.

Together with 135389, it forms a pair of twin primes.

It is a Chen prime.

135391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67695 + 67696.

It is an arithmetic number, because the mean of its divisors is an integer number (67696).

2¹³⁵³⁹¹ is an apocalyptic number.

135391 is a deficient number, since it is larger than the sum of its proper divisors (1).

135391 is an equidigital number, since it uses as much as digits as its factorization.

135391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 405, while the sum is 22.

The square root of 135391 is about 367.9551603117. The cubic root of 135391 is about 51.3487566331.

It can be divided in two parts, 1353 and 91, that added together give a square (1444 = 38²).

The spelling of 135391 in words is "one hundred thirty-five thousand, three hundred ninety-one".