243401 has 2 divisors, whose sum is σ = 243402. Its totient is φ = 243400.

The previous prime is 243391. The next prime is 243403. The reversal of 243401 is 104342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203401 + 40000 = 451^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 243401 - 2¹⁰ = 242377 is a prime.

Together with 243403, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 8.

It is not a weakly prime, because it can be changed into another prime (243403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121700 + 121701.

It is an arithmetic number, because the mean of its divisors is an integer number (121701).

2²⁴³⁴⁰¹ is an apocalyptic number.

It is an amenable number.

243401 is a deficient number, since it is larger than the sum of its proper divisors (1).

243401 is an equidigital number, since it uses as much as digits as its factorization.

243401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 243401 is about 493.3568688080. The cubic root of 243401 is about 62.4368214905.

Adding to 243401 its reverse (104342), we get a palindrome (347743).

The spelling of 243401 in words is "two hundred forty-three thousand, four hundred one", and thus it is an iban number.