135659761 has 4 divisors (see below), whose sum is σ = 135830772. Its totient is φ = 135488752.

The previous prime is 135659747. The next prime is 135659789. The reversal of 135659761 is 167956531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167956531 = 173 ⋅970847.

It can be written as a sum of positive squares in 2 ways, for example, as 37748736 + 97911025 = 6144^2 + 9895^2 .

It is a cyclic number.

It is not a de Polignac number, because 135659761 - 2⁷ = 135659633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135659731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84310 + ... + 85903.

It is an arithmetic number, because the mean of its divisors is an integer number (33957693).

Almost surely, 2^135659761 is an apocalyptic number.

It is an amenable number.

135659761 is a deficient number, since it is larger than the sum of its proper divisors (171011).

135659761 is an equidigital number, since it uses as much as digits as its factorization.

135659761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171010.

The product of its digits is 170100, while the sum is 43.

The square root of 135659761 is about 11647.3070278069. The cubic root of 135659761 is about 513.8271118340.

The spelling of 135659761 in words is "one hundred thirty-five million, six hundred fifty-nine thousand, seven hundred sixty-one".