243911 has 2 divisors, whose sum is σ = 243912. Its totient is φ = 243910.

The previous prime is 243889. The next prime is 243917. The reversal of 243911 is 119342.

243911 is nontrivially palindromic in base 12.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243911 - 2¹⁰ = 242887 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243917) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121955 + 121956.

It is an arithmetic number, because the mean of its divisors is an integer number (121956).

2²⁴³⁹¹¹ is an apocalyptic number.

243911 is a deficient number, since it is larger than the sum of its proper divisors (1).

243911 is an equidigital number, since it uses as much as digits as its factorization.

243911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 243911 is about 493.8734655760. The cubic root of 243911 is about 62.4803991869.

The spelling of 243911 in words is "two hundred forty-three thousand, nine hundred eleven".