136280809 has 12 divisors (see below), whose sum is σ = 158899584. Its totient is φ = 116540424.

The previous prime is 136280801. The next prime is 136280839. The reversal of 136280809 is 908082631.

It is not a de Polignac number, because 136280809 - 2³ = 136280801 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 (136280801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19684 + ... + 25690.

It is an arithmetic number, because the mean of its divisors is an integer number (13241632).

Almost surely, 2^136280809 is an apocalyptic number.

It is an amenable number.

136280809 is a deficient number, since it is larger than the sum of its proper divisors (22618775).

136280809 is an equidigital number, since it uses as much as digits as its factorization.

136280809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6484 (or 6477 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 136280809 is about 11673.9371678967. The cubic root of 136280809 is about 514.6100155007.

The spelling of 136280809 in words is "one hundred thirty-six million, two hundred eighty thousand, eight hundred nine".