136180805 has 4 divisors (see below), whose sum is σ = 163416972. Its totient is φ = 108944640.

The previous prime is 136180789. The next prime is 136180813. The reversal of 136180805 is 508081631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508081631 = 293 ⋅1734067.

It can be written as a sum of positive squares in 2 ways, for example, as 53479969 + 82700836 = 7313^2 + 9094^2 .

It is not a de Polignac number, because 136180805 - 2⁴ = 136180789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13618076 + ... + 13618085.

It is an arithmetic number, because the mean of its divisors is an integer number (40854243).

Almost surely, 2^136180805 is an apocalyptic number.

It is an amenable number.

136180805 is a deficient number, since it is larger than the sum of its proper divisors (27236167).

136180805 is an equidigital number, since it uses as much as digits as its factorization.

136180805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27236166.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 136180805 is about 11669.6531653687. The cubic root of 136180805 is about 514.4841096510.

The spelling of 136180805 in words is "one hundred thirty-six million, one hundred eighty thousand, eight hundred five".