135799865 has 8 divisors (see below), whose sum is σ = 163349448. Its totient is φ = 108380160.

The previous prime is 135799841. The next prime is 135799877. The reversal of 135799865 is 568997531.

It can be written as a sum of positive squares in 4 ways, for example, as 4857616 + 130942249 = 2204^2 + 11443^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135799865 - 2⁶ = 135799801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30152 + ... + 34361.

It is an arithmetic number, because the mean of its divisors is an integer number (20418681).

Almost surely, 2^135799865 is an apocalyptic number.

It is an amenable number.

135799865 is a deficient number, since it is larger than the sum of its proper divisors (27549583).

135799865 is an equidigital number, since it uses as much as digits as its factorization.

135799865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64939.

The product of its digits is 2041200, while the sum is 53.

The square root of 135799865 is about 11653.3199132264. The cubic root of 135799865 is about 514.0039377029.

The spelling of 135799865 in words is "one hundred thirty-five million, seven hundred ninety-nine thousand, eight hundred sixty-five".