136256909 has 8 divisors (see below), whose sum is σ = 139877760. Its totient is φ = 132683616.

The previous prime is 136256891. The next prime is 136256933. The reversal of 136256909 is 909652631.

136256909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 136256909 - 2¹² = 136252813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136256969) 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, 6047 + ... + 17580.

It is an arithmetic number, because the mean of its divisors is an integer number (17484720).

Almost surely, 2^136256909 is an apocalyptic number.

It is an amenable number.

136256909 is a deficient number, since it is larger than the sum of its proper divisors (3620851).

136256909 is an equidigital number, since it uses as much as digits as its factorization.

136256909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23779.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 136256909 is about 11672.9134752212. The cubic root of 136256909 is about 514.5799308088.

The spelling of 136256909 in words is "one hundred thirty-six million, two hundred fifty-six thousand, nine hundred nine".