243220143 has 4 divisors (see below), whose sum is σ = 324293528. Its totient is φ = 162146760.

The previous prime is 243220099. The next prime is 243220189. The reversal of 243220143 is 341022342.

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

It is not a de Polignac number, because 243220143 - 2⁸ = 243219887 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 (243220643) 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, 40536688 + ... + 40536693.

It is an arithmetic number, because the mean of its divisors is an integer number (81073382).

Almost surely, 2^243220143 is an apocalyptic number.

243220143 is a deficient number, since it is larger than the sum of its proper divisors (81073385).

243220143 is an equidigital number, since it uses as much as digits as its factorization.

243220143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81073384.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 243220143 is about 15595.5167596332. The cubic root of 243220143 is about 624.2135327927.

Adding to 243220143 its reverse (341022342), we get a palindrome (584242485).

The spelling of 243220143 in words is "two hundred forty-three million, two hundred twenty thousand, one hundred forty-three".