243131143 has 4 divisors (see below), whose sum is σ = 243372168. Its totient is φ = 242890120.

The previous prime is 243131069. The next prime is 243131167. The reversal of 243131143 is 341131342.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243131143 is a prime.

It is a super-2 number, since 2×243131143² = 118225505392972898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243135143) 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, 118993 + ... + 121018.

It is an arithmetic number, because the mean of its divisors is an integer number (60843042).

Almost surely, 2^243131143 is an apocalyptic number.

243131143 is a deficient number, since it is larger than the sum of its proper divisors (241025).

243131143 is a wasteful number, since it uses less digits than its factorization.

243131143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241024.

The product of its digits is 864, while the sum is 22.

The square root of 243131143 is about 15592.6631144266. The cubic root of 243131143 is about 624.1373853413.

Adding to 243131143 its reverse (341131342), we get a palindrome (584262485).

The spelling of 243131143 in words is "two hundred forty-three million, one hundred thirty-one thousand, one hundred forty-three".