136448689 has 4 divisors (see below), whose sum is σ = 146944756. Its totient is φ = 125952624.

The previous prime is 136448623. The next prime is 136448693. The reversal of 136448689 is 986844631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986844631 = 241 ⋅4094791.

It can be written as a sum of positive squares in 2 ways, for example, as 10627600 + 125821089 = 3260^2 + 11217^2 .

It is a cyclic number.

It is not a de Polignac number, because 136448689 - 2⁷ = 136448561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136448699) 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, 5248014 + ... + 5248039.

It is an arithmetic number, because the mean of its divisors is an integer number (36736189).

Almost surely, 2^136448689 is an apocalyptic number.

It is an amenable number.

136448689 is a deficient number, since it is larger than the sum of its proper divisors (10496067).

136448689 is a wasteful number, since it uses less digits than its factorization.

136448689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10496066.

The product of its digits is 995328, while the sum is 49.

The square root of 136448689 is about 11681.1253310629. The cubic root of 136448689 is about 514.8212393687.

The spelling of 136448689 in words is "one hundred thirty-six million, four hundred forty-eight thousand, six hundred eighty-nine".