243173231 has 6 divisors (see below), whose sum is σ = 282875040. Its totient is φ = 208434156.

The previous prime is 243173221. The next prime is 243173237. The reversal of 243173231 is 132371342.

It is a de Polignac number, because none of the positive numbers 2^k-243173231 is a prime.

It is a super-2 number, since 2×243173231² = 118266440549958722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243173231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243173237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2481311 + ... + 2481408.

It is an arithmetic number, because the mean of its divisors is an integer number (47145840).

Almost surely, 2^243173231 is an apocalyptic number.

243173231 is a deficient number, since it is larger than the sum of its proper divisors (39701809).

243173231 is an equidigital number, since it uses as much as digits as its factorization.

243173231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962733 (or 4962726 counting only the distinct ones).

The product of its digits is 3024, while the sum is 26.

The square root of 243173231 is about 15594.0126651225. The cubic root of 243173231 is about 624.1733977011.

The spelling of 243173231 in words is "two hundred forty-three million, one hundred seventy-three thousand, two hundred thirty-one".