243121143 has 4 divisors (see below), whose sum is σ = 324161528. Its totient is φ = 162080760.

The previous prime is 243121139. The next prime is 243121213. The reversal of 243121143 is 341121342.

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

It is not a de Polignac number, because 243121143 - 2² = 243121139 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 (243121243) 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, 40520188 + ... + 40520193.

It is an arithmetic number, because the mean of its divisors is an integer number (81040382).

Almost surely, 2^243121143 is an apocalyptic number.

243121143 is a deficient number, since it is larger than the sum of its proper divisors (81040385).

243121143 is an equidigital number, since it uses as much as digits as its factorization.

243121143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81040384.

The product of its digits is 576, while the sum is 21.

The square root of 243121143 is about 15592.3424474965. The cubic root of 243121143 is about 624.1288282866.

Adding to 243121143 its reverse (341121342), we get a palindrome (584242485).

The spelling of 243121143 in words is "two hundred forty-three million, one hundred twenty-one thousand, one hundred forty-three".