136813823 has 4 divisors (see below), whose sum is σ = 137195280. Its totient is φ = 136432368.

The previous prime is 136813811. The next prime is 136813847. The reversal of 136813823 is 328318631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328318631 = 43 ⋅7635317.

It is a cyclic number.

It is not a de Polignac number, because 136813823 - 2⁶ = 136813759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136813123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190190 + ... + 190907.

It is an arithmetic number, because the mean of its divisors is an integer number (34298820).

Almost surely, 2^136813823 is an apocalyptic number.

136813823 is a deficient number, since it is larger than the sum of its proper divisors (381457).

136813823 is an equidigital number, since it uses as much as digits as its factorization.

136813823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381456.

The product of its digits is 20736, while the sum is 35.

The square root of 136813823 is about 11696.7441196258. The cubic root of 136813823 is about 515.2800475180.

The spelling of 136813823 in words is "one hundred thirty-six million, eight hundred thirteen thousand, eight hundred twenty-three".