243351304309 has 2 divisors, whose sum is σ = 243351304310. Its totient is φ = 243351304308.

The previous prime is 243351304307. The next prime is 243351304333. The reversal of 243351304309 is 903403153342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228200156209 + 15151148100 = 477703^2 + 123090^2 .

It is a cyclic number.

It is not a de Polignac number, because 243351304309 - 2¹ = 243351304307 is a prime.

Together with 243351304307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243351304307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121675652154 + 121675652155.

It is an arithmetic number, because the mean of its divisors is an integer number (121675652155).

Almost surely, 2^243351304309 is an apocalyptic number.

It is an amenable number.

243351304309 is a deficient number, since it is larger than the sum of its proper divisors (1).

243351304309 is an equidigital number, since it uses as much as digits as its factorization.

243351304309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 37.

The spelling of 243351304309 in words is "two hundred forty-three billion, three hundred fifty-one million, three hundred four thousand, three hundred nine".