243305434309 has 4 divisors (see below), whose sum is σ = 278063353504. Its totient is φ = 208547515116.

The previous prime is 243305434303. The next prime is 243305434321. The reversal of 243305434309 is 903434503342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243305434309 - 2⁵ = 243305434277 is a prime.

It is a super-2 number, since 2×243305434309² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243305434303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17378959587 + ... + 17378959600.

It is an arithmetic number, because the mean of its divisors is an integer number (69515838376).

Almost surely, 2^243305434309 is an apocalyptic number.

It is an amenable number.

243305434309 is a deficient number, since it is larger than the sum of its proper divisors (34757919195).

243305434309 is an equidigital number, since it uses as much as digits as its factorization.

243305434309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34757919194.

The product of its (nonzero) digits is 466560, while the sum is 40.

The spelling of 243305434309 in words is "two hundred forty-three billion, three hundred five million, four hundred thirty-four thousand, three hundred nine".