135864081 has 16 divisors (see below), whose sum is σ = 203065920. Its totient is φ = 89772480.

The previous prime is 135864077. The next prime is 135864083. The reversal of 135864081 is 180468531.

135864081 is a `hidden beast` number, since 1 + 3 + 5 + 8 + 640 + 8 + 1 = 666.

It is not a de Polignac number, because 135864081 - 2² = 135864077 is a prime.

It is a super-2 number, since 2×135864081² = 36918097011949122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135864083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19215 + ... + 25316.

It is an arithmetic number, because the mean of its divisors is an integer number (12691620).

Almost surely, 2^135864081 is an apocalyptic number.

It is an amenable number.

135864081 is a deficient number, since it is larger than the sum of its proper divisors (67201839).

135864081 is a wasteful number, since it uses less digits than its factorization.

135864081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44653 (or 44647 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 135864081 is about 11656.0748539120. The cubic root of 135864081 is about 514.0849443507.

The spelling of 135864081 in words is "one hundred thirty-five million, eight hundred sixty-four thousand, eighty-one".