135091 has 4 divisors (see below), whose sum is σ = 147384. Its totient is φ = 122800.

The previous prime is 135089. The next prime is 135101. The reversal of 135091 is 190531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190531 = 11 ⋅17321.

It is a cyclic number.

It is not a de Polignac number, because 135091 - 2¹ = 135089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135391) 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, 6130 + ... + 6151.

It is an arithmetic number, because the mean of its divisors is an integer number (36846).

2¹³⁵⁰⁹¹ is an apocalyptic number.

135091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135091 is a deficient number, since it is larger than the sum of its proper divisors (12293).

135091 is a wasteful number, since it uses less digits than its factorization.

135091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12292.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 135091 is about 367.5472758707. The cubic root of 135091 is about 51.3108023159.

It can be divided in two parts, 1350 and 91, that added together give a palindrome (1441).

The spelling of 135091 in words is "one hundred thirty-five thousand, ninety-one".