135211081 has 4 divisors (see below), whose sum is σ = 143164692. Its totient is φ = 127257472.

The previous prime is 135211073. The next prime is 135211103. The reversal of 135211081 is 180112531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90535225 + 44675856 = 9515^2 + 6684^2 .

It is a cyclic number.

It is not a de Polignac number, because 135211081 - 2³ = 135211073 is a prime.

It is a super-3 number, since 3×135211081³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135211031) 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, 3976780 + ... + 3976813.

It is an arithmetic number, because the mean of its divisors is an integer number (35791173).

Almost surely, 2^135211081 is an apocalyptic number.

It is an amenable number.

135211081 is a deficient number, since it is larger than the sum of its proper divisors (7953611).

135211081 is an equidigital number, since it uses as much as digits as its factorization.

135211081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7953610.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 135211081 is about 11628.0299707216. The cubic root of 135211081 is about 513.2600102821.

The spelling of 135211081 in words is "one hundred thirty-five million, two hundred eleven thousand, eighty-one".