243686351 has 2 divisors, whose sum is σ = 243686352. Its totient is φ = 243686350.

The previous prime is 243686341. The next prime is 243686353. The reversal of 243686351 is 153686342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243686351 is a prime.

Together with 243686353, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243686353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121843175 + 121843176.

It is an arithmetic number, because the mean of its divisors is an integer number (121843176).

Almost surely, 2^243686351 is an apocalyptic number.

243686351 is a deficient number, since it is larger than the sum of its proper divisors (1).

243686351 is an equidigital number, since it uses as much as digits as its factorization.

243686351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 38.

The square root of 243686351 is about 15610.4564635375. The cubic root of 243686351 is about 624.6121121720.

Subtracting from 243686351 its reverse (153686342), we obtain a palindrome (90000009).

The spelling of 243686351 in words is "two hundred forty-three million, six hundred eighty-six thousand, three hundred fifty-one".