135081 has 8 divisors (see below), whose sum is σ = 200160. Its totient is φ = 90036.

The previous prime is 135077. The next prime is 135089. The reversal of 135081 is 180531.

It is a happy number.

135081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135081 - 2² = 135077 is a prime.

It is a super-2 number, since 2×135081² = 36493753122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2475 + ... + 2528.

It is an arithmetic number, because the mean of its divisors is an integer number (25020).

2¹³⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

135081 is a deficient number, since it is larger than the sum of its proper divisors (65079).

135081 is an equidigital number, since it uses as much as digits as its factorization.

135081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5012 (or 5006 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 135081 is about 367.5336719268. The cubic root of 135081 is about 51.3095362047.

It can be divided in two parts, 1350 and 81, that added together give a triangular number (1431 = T₅₃).

The spelling of 135081 in words is "one hundred thirty-five thousand, eighty-one".