136696509 has 6 divisors (see below), whose sum is σ = 197450526. Its totient is φ = 91131000.

The previous prime is 136696499. The next prime is 136696519. The reversal of 136696509 is 905696631.

136696509 is a `hidden beast` number, since 136 + 6 + 9 + 6 + 509 = 666.

136696509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (136696499) and next prime (136696519).

It can be written as a sum of positive squares in only one way, i.e., 135070884 + 1625625 = 11622^2 + 1275^2 .

It is not a de Polignac number, because 136696509 - 2¹³ = 136688317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136696519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7594242 + ... + 7594259.

It is an arithmetic number, because the mean of its divisors is an integer number (32908421).

Almost surely, 2^136696509 is an apocalyptic number.

It is an amenable number.

136696509 is a deficient number, since it is larger than the sum of its proper divisors (60754017).

136696509 is a wasteful number, since it uses less digits than its factorization.

136696509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15188507 (or 15188504 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 136696509 is about 11691.7282298213. The cubic root of 136696509 is about 515.1327260259.

The spelling of 136696509 in words is "one hundred thirty-six million, six hundred ninety-six thousand, five hundred nine".