243123143 has 2 divisors, whose sum is σ = 243123144. Its totient is φ = 243123142.

The previous prime is 243123119. The next prime is 243123149. The reversal of 243123143 is 341321342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243123143 - 2⁶ = 243123079 is a prime.

It is equal to p_13323281 and since 243123143 and 13323281 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243123149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561571 + 121561572.

It is an arithmetic number, because the mean of its divisors is an integer number (121561572).

Almost surely, 2^243123143 is an apocalyptic number.

243123143 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123143 is an equidigital number, since it uses as much as digits as its factorization.

243123143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 243123143 is about 15592.4065814101. The cubic root of 243123143 is about 624.1305397163.

Adding to 243123143 its reverse (341321342), we get a palindrome (584444485).

The spelling of 243123143 in words is "two hundred forty-three million, one hundred twenty-three thousand, one hundred forty-three".