243172253 has 4 divisors (see below), whose sum is σ = 243434940. Its totient is φ = 242909568.

The previous prime is 243172247. The next prime is 243172273. The reversal of 243172253 is 352271342.

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 36445369 + 206726884 = 6037^2 + 14378^2 .

It is a cyclic number.

It is not a de Polignac number, because 243172253 - 2⁸ = 243171997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243172213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129950 + ... + 131807.

It is an arithmetic number, because the mean of its divisors is an integer number (60858735).

Almost surely, 2^243172253 is an apocalyptic number.

It is an amenable number.

243172253 is a deficient number, since it is larger than the sum of its proper divisors (262687).

243172253 is an equidigital number, since it uses as much as digits as its factorization.

243172253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262686.

The product of its digits is 10080, while the sum is 29.

The square root of 243172253 is about 15593.9813069017. The cubic root of 243172253 is about 624.1725609281.

It can be divided in two parts, 243172 and 253, that multiplied together give a palindrome (61522516).

The spelling of 243172253 in words is "two hundred forty-three million, one hundred seventy-two thousand, two hundred fifty-three".