136909 has 4 divisors (see below), whose sum is σ = 141660. Its totient is φ = 132160.

The previous prime is 136897. The next prime is 136943. The reversal of 136909 is 909631.

It is a happy number.

136909 is nontrivially palindromic in base 14.

136909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72900 + 64009 = 270^2 + 253^2 .

It is a cyclic number.

It is not a de Polignac number, because 136909 - 2⁹ = 136397 is a prime.

It is a Duffinian number.

136909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2332 + ... + 2389.

It is an arithmetic number, because the mean of its divisors is an integer number (35415).

2¹³⁶⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

136909 is a deficient number, since it is larger than the sum of its proper divisors (4751).

136909 is an equidigital number, since it uses as much as digits as its factorization.

136909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4750.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 136909 is about 370.0121619623. The cubic root of 136909 is about 51.5399507769.

The spelling of 136909 in words is "one hundred thirty-six thousand, nine hundred nine".