243407504309 has 2 divisors, whose sum is σ = 243407504310. Its totient is φ = 243407504308.

The previous prime is 243407504267. The next prime is 243407504369. The reversal of 243407504309 is 903405704342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232917238225 + 10490266084 = 482615^2 + 102422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243407504309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243407504369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121703752154 + 121703752155.

It is an arithmetic number, because the mean of its divisors is an integer number (121703752155).

Almost surely, 2^243407504309 is an apocalyptic number.

It is an amenable number.

243407504309 is a deficient number, since it is larger than the sum of its proper divisors (1).

243407504309 is an equidigital number, since it uses as much as digits as its factorization.

243407504309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 243407504309 in words is "two hundred forty-three billion, four hundred seven million, five hundred four thousand, three hundred nine".