136336681 has 4 divisors (see below), whose sum is σ = 146824132. Its totient is φ = 125849232.

The previous prime is 136336679. The next prime is 136336721. The reversal of 136336681 is 186633631.

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 53890281 + 82446400 = 7341^2 + 9080^2 .

It is a cyclic number.

It is not a de Polignac number, because 136336681 - 2¹ = 136336679 is a prime.

It is a super-2 number, since 2×136336681² = 37175381172191522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136336681.

It is not an unprimeable number, because it can be changed into a prime (136336181) 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, 5243706 + ... + 5243731.

It is an arithmetic number, because the mean of its divisors is an integer number (36706033).

Almost surely, 2^136336681 is an apocalyptic number.

It is an amenable number.

136336681 is a deficient number, since it is larger than the sum of its proper divisors (10487451).

136336681 is a wasteful number, since it uses less digits than its factorization.

136336681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10487450.

The product of its digits is 46656, while the sum is 37.

The square root of 136336681 is about 11676.3299456636. The cubic root of 136336681 is about 514.6803319858.

The spelling of 136336681 in words is "one hundred thirty-six million, three hundred thirty-six thousand, six hundred eighty-one".