135715865 has 4 divisors (see below), whose sum is σ = 162859044. Its totient is φ = 108572688.

The previous prime is 135715843. The next prime is 135715891. The reversal of 135715865 is 568517531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568517531 = 137 ⋅4149763.

It can be written as a sum of positive squares in 2 ways, for example, as 102353689 + 33362176 = 10117^2 + 5776^2 .

It is a cyclic number.

It is not a de Polignac number, because 135715865 - 2⁸ = 135715609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13571582 + ... + 13571591.

It is an arithmetic number, because the mean of its divisors is an integer number (40714761).

Almost surely, 2^135715865 is an apocalyptic number.

It is an amenable number.

135715865 is a deficient number, since it is larger than the sum of its proper divisors (27143179).

135715865 is an equidigital number, since it uses as much as digits as its factorization.

135715865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27143178.

The product of its digits is 126000, while the sum is 41.

The square root of 135715865 is about 11649.7152325711. The cubic root of 135715865 is about 513.8979355451.

The spelling of 135715865 in words is "one hundred thirty-five million, seven hundred fifteen thousand, eight hundred sixty-five".