243555343 has 2 divisors, whose sum is σ = 243555344. Its totient is φ = 243555342.

The previous prime is 243555307. The next prime is 243555359. The reversal of 243555343 is 343555342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243555343 - 2²⁵ = 210000911 is a prime.

It is equal to p_13345657 and since 243555343 and 13345657 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 243555299 and 243555308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243555043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121777671 + 121777672.

It is an arithmetic number, because the mean of its divisors is an integer number (121777672).

Almost surely, 2^243555343 is an apocalyptic number.

243555343 is a deficient number, since it is larger than the sum of its proper divisors (1).

243555343 is an equidigital number, since it uses as much as digits as its factorization.

243555343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 34.

The square root of 243555343 is about 15606.2597376822. The cubic root of 243555343 is about 624.5001597221.

Subtracting 243555343 from its reverse (343555342), we obtain a palindrome (99999999).

The spelling of 243555343 in words is "two hundred forty-three million, five hundred fifty-five thousand, three hundred forty-three".