136687 has 4 divisors (see below), whose sum is σ = 139320. Its totient is φ = 134056.

The previous prime is 136657. The next prime is 136691. The reversal of 136687 is 786631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786631 = 173 ⋅4547.

It is a cyclic number.

It is not a de Polignac number, because 136687 - 2⁷ = 136559 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1237 + ... + 1342.

It is an arithmetic number, because the mean of its divisors is an integer number (34830).

2¹³⁶⁶⁸⁷ is an apocalyptic number.

136687 is a deficient number, since it is larger than the sum of its proper divisors (2633).

136687 is an equidigital number, since it uses as much as digits as its factorization.

136687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632.

The product of its digits is 6048, while the sum is 31.

The square root of 136687 is about 369.7120501147. The cubic root of 136687 is about 51.5120781047.

The spelling of 136687 in words is "one hundred thirty-six thousand, six hundred eighty-seven".