136218787 has 4 divisors (see below), whose sum is σ = 138527640. Its totient is φ = 133909936.

The previous prime is 136218781. The next prime is 136218799. The reversal of 136218787 is 787812631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 787812631 = 3061 ⋅257371.

It is a cyclic number.

It is not a de Polignac number, because 136218787 - 2³ = 136218779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136218781) 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 3 ways as a sum of consecutive naturals, for example, 1154338 + ... + 1154455.

It is an arithmetic number, because the mean of its divisors is an integer number (34631910).

Almost surely, 2^136218787 is an apocalyptic number.

136218787 is a deficient number, since it is larger than the sum of its proper divisors (2308853).

136218787 is an equidigital number, since it uses as much as digits as its factorization.

136218787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308852.

The product of its digits is 112896, while the sum is 43.

The square root of 136218787 is about 11671.2804353250. The cubic root of 136218787 is about 514.5319365554.

The spelling of 136218787 in words is "one hundred thirty-six million, two hundred eighteen thousand, seven hundred eighty-seven".