136601809 has 2 divisors, whose sum is σ = 136601810. Its totient is φ = 136601808.

The previous prime is 136601797. The next prime is 136601813. The reversal of 136601809 is 908106631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102414400 + 34187409 = 10120^2 + 5847^2 .

It is a cyclic number.

It is not a de Polignac number, because 136601809 - 2¹¹ = 136599761 is a prime.

It is equal to p_7730953 and since 136601809 and 7730953 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (136601879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68300904 + 68300905.

It is an arithmetic number, because the mean of its divisors is an integer number (68300905).

Almost surely, 2^136601809 is an apocalyptic number.

It is an amenable number.

136601809 is a deficient number, since it is larger than the sum of its proper divisors (1).

136601809 is an equidigital number, since it uses as much as digits as its factorization.

136601809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 136601809 is about 11687.6776564038. The cubic root of 136601809 is about 515.0137414249.

The spelling of 136601809 in words is "one hundred thirty-six million, six hundred one thousand, eight hundred nine".