135689 has 4 divisors (see below), whose sum is σ = 138624.
Its totient is φ = 132756.
The previous prime is 135671. The next prime is 135697. The reversal of 135689 is 986531.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 135689 - 28 = 135433 is a prime.
It is a Duffinian number.
It is a plaindrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (135649) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1397 + ... + 1490.
It is an arithmetic number, because the mean of its divisors is an integer number (34656).
2135689 is an apocalyptic number.
It is an amenable number.
135689 is a deficient number, since it is larger than the sum of its proper divisors (2935).
135689 is an equidigital number, since it uses as much as digits as its factorization.
135689 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2934.
The product of its digits is 6480, while the sum is 32.
The square root of 135689 is about 368.3598783798.
The cubic root of 135689 is about 51.3864024552.
The spelling of 135689 in words is "one hundred thirty-five thousand, six hundred eighty-nine".