135173243 has 4 divisors (see below), whose sum is σ = 135394368. Its totient is φ = 134952120.

The previous prime is 135173197. The next prime is 135173251. The reversal of 135173243 is 342371531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135173243 - 2⁶ = 135173179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135173293) 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, 109643 + ... + 110868.

It is an arithmetic number, because the mean of its divisors is an integer number (33848592).

Almost surely, 2^135173243 is an apocalyptic number.

135173243 is a deficient number, since it is larger than the sum of its proper divisors (221125).

135173243 is an equidigital number, since it uses as much as digits as its factorization.

135173243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221124.

The product of its digits is 7560, while the sum is 29.

The square root of 135173243 is about 11626.4028400877. The cubic root of 135173243 is about 513.2121282496.

The spelling of 135173243 in words is "one hundred thirty-five million, one hundred seventy-three thousand, two hundred forty-three".