243686341 has 2 divisors, whose sum is σ = 243686342. Its totient is φ = 243686340.

The previous prime is 243686297. The next prime is 243686351. The reversal of 243686341 is 143686342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228312100 + 15374241 = 15110^2 + 3921^2 .

It is a cyclic number.

It is not a de Polignac number, because 243686341 - 2²⁷ = 109468613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243686341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243686351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121843170 + 121843171.

It is an arithmetic number, because the mean of its divisors is an integer number (121843171).

Almost surely, 2^243686341 is an apocalyptic number.

It is an amenable number.

243686341 is a deficient number, since it is larger than the sum of its proper divisors (1).

243686341 is an equidigital number, since it uses as much as digits as its factorization.

243686341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 37.

The square root of 243686341 is about 15610.4561432394. The cubic root of 243686341 is about 624.6121036281.

Subtracting from 243686341 its reverse (143686342), we obtain a palindrome (99999999).

The spelling of 243686341 in words is "two hundred forty-three million, six hundred eighty-six thousand, three hundred forty-one".