135686009 has 2 divisors, whose sum is σ = 135686010. Its totient is φ = 135686008.

The previous prime is 135686003. The next prime is 135686029. The reversal of 135686009 is 900686531.

135686009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93799225 + 41886784 = 9685^2 + 6472^2 .

It is a cyclic number.

It is not a de Polignac number, because 135686009 - 2¹⁶ = 135620473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135686003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67843004 + 67843005.

It is an arithmetic number, because the mean of its divisors is an integer number (67843005).

Almost surely, 2^135686009 is an apocalyptic number.

It is an amenable number.

135686009 is a deficient number, since it is larger than the sum of its proper divisors (1).

135686009 is an equidigital number, since it uses as much as digits as its factorization.

135686009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 135686009 is about 11648.4337573770. The cubic root of 135686009 is about 513.8602488138.

The spelling of 135686009 in words is "one hundred thirty-five million, six hundred eighty-six thousand, nine".