243169 has 4 divisors (see below), whose sum is σ = 244420. Its totient is φ = 241920.

The previous prime is 243167. The next prime is 243197. The reversal of 243169 is 961342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 129600 + 113569 = 360^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 243169 - 2¹ = 243167 is a prime.

It is a super-2 number, since 2×243169² = 118262325122, which contains 22 as substring.

It is a Duffinian number.

243169 is a lucky number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (243161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264 + ... + 745.

It is an arithmetic number, because the mean of its divisors is an integer number (61105).

2²⁴³¹⁶⁹ is an apocalyptic number.

It is an amenable number.

243169 is a deficient number, since it is larger than the sum of its proper divisors (1251).

243169 is a wasteful number, since it uses less digits than its factorization.

243169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250.

The product of its digits is 1296, while the sum is 25.

The square root of 243169 is about 493.1216888355. The cubic root of 243169 is about 62.4169777658.

It can be divided in two parts, 2431 and 69, that added together give a square (2500 = 50²).

The spelling of 243169 in words is "two hundred forty-three thousand, one hundred sixty-nine".