243431 has 2 divisors, whose sum is σ = 243432.
Its totient is φ = 243430.
The previous prime is 243421. The next prime is 243433. The reversal of 243431 is 134342.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 243431 - 26 = 243367 is a prime.
It is a super-2 number, since 2×2434312 = 118517303522, which contains 22 as substring.
Together with 243433, it forms a pair of twin primes.
It is a Chen prime.
It is a d-powerful number, because it can be written as 2 + 42 + 48 + 36 + 311 + 1 .
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (243433) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121715 + 121716.
It is an arithmetic number, because the mean of its divisors is an integer number (121716).
2243431 is an apocalyptic number.
243431 is a deficient number, since it is larger than the sum of its proper divisors (1).
243431 is an equidigital number, since it uses as much as digits as its factorization.
243431 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 288, while the sum is 17.
The square root of 243431 is about 493.3872718261.
The cubic root of 243431 is about 62.4393865685.
Adding to 243431 its reverse (134342), we get a palindrome (377773).
The spelling of 243431 in words is "two hundred forty-three thousand, four hundred thirty-one".