136155209 has 8 divisors (see below), whose sum is σ = 138412800. Its totient is φ = 133907200.

The previous prime is 136155199. The next prime is 136155223. The reversal of 136155209 is 902551631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 136155209 - 2¹⁶ = 136089673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136155289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29744 + ... + 34014.

It is an arithmetic number, because the mean of its divisors is an integer number (17301600).

Almost surely, 2^136155209 is an apocalyptic number.

It is an amenable number.

136155209 is a deficient number, since it is larger than the sum of its proper divisors (2257591).

136155209 is an equidigital number, since it uses as much as digits as its factorization.

136155209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 136155209 is about 11668.5564231399. The cubic root of 136155209 is about 514.4518741721.

The spelling of 136155209 in words is "one hundred thirty-six million, one hundred fifty-five thousand, two hundred nine".