135844217 has 4 divisors (see below), whose sum is σ = 135877236. Its totient is φ = 135811200.

The previous prime is 135844211. The next prime is 135844223. The reversal of 135844217 is 712448531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712448531 = 139 ⋅5125529.

It is an interprime number because it is at equal distance from previous prime (135844211) and next prime (135844223).

It can be written as a sum of positive squares in 2 ways, for example, as 47183161 + 88661056 = 6869^2 + 9416^2 .

It is a cyclic number.

It is not a de Polignac number, because 135844217 - 2¹⁶ = 135778681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135844211) 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, 9284 + ... + 18917.

It is an arithmetic number, because the mean of its divisors is an integer number (33969309).

Almost surely, 2^135844217 is an apocalyptic number.

It is an amenable number.

135844217 is a deficient number, since it is larger than the sum of its proper divisors (33019).

135844217 is an equidigital number, since it uses as much as digits as its factorization.

135844217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33018.

The product of its digits is 26880, while the sum is 35.

The square root of 135844217 is about 11655.2227348944. Note that the first 3 decimals coincide. The cubic root of 135844217 is about 514.0598892099.

The spelling of 135844217 in words is "one hundred thirty-five million, eight hundred forty-four thousand, two hundred seventeen".