135868217 has 4 divisors (see below), whose sum is σ = 136247040. Its totient is φ = 135489396.

The previous prime is 135868207. The next prime is 135868237. The reversal of 135868217 is 712868531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 712868531 = 17 ⋅41933443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135868217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135868207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188873 + ... + 189590.

It is an arithmetic number, because the mean of its divisors is an integer number (34061760).

Almost surely, 2^135868217 is an apocalyptic number.

It is an amenable number.

135868217 is a deficient number, since it is larger than the sum of its proper divisors (378823).

135868217 is an equidigital number, since it uses as much as digits as its factorization.

135868217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378822.

The product of its digits is 80640, while the sum is 41.

The square root of 135868217 is about 11656.2522707773. The cubic root of 135868217 is about 514.0901609214.

The spelling of 135868217 in words is "one hundred thirty-five million, eight hundred sixty-eight thousand, two hundred seventeen".