243909394247 has 2 divisors, whose sum is σ = 243909394248. Its totient is φ = 243909394246.

The previous prime is 243909394237. The next prime is 243909394249. The reversal of 243909394247 is 742493909342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243909394247 - 2²⁰ = 243908345671 is a prime.

Together with 243909394249, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 243909394192 and 243909394201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243909394249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121954697123 + 121954697124.

It is an arithmetic number, because the mean of its divisors is an integer number (121954697124).

Almost surely, 2^243909394247 is an apocalyptic number.

243909394247 is a deficient number, since it is larger than the sum of its proper divisors (1).

243909394247 is an equidigital number, since it uses as much as digits as its factorization.

243909394247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 56.

The spelling of 243909394247 in words is "two hundred forty-three billion, nine hundred nine million, three hundred ninety-four thousand, two hundred forty-seven".