243505434351 has 4 divisors (see below), whose sum is σ = 324673912472. Its totient is φ = 162336956232.

The previous prime is 243505434317. The next prime is 243505434353. The reversal of 243505434351 is 153434505342.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 243505434351 - 2⁷ = 243505434223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243505434353) 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, 40584239056 + ... + 40584239061.

It is an arithmetic number, because the mean of its divisors is an integer number (81168478118).

Almost surely, 2^243505434351 is an apocalyptic number.

243505434351 is a deficient number, since it is larger than the sum of its proper divisors (81168478121).

243505434351 is an equidigital number, since it uses as much as digits as its factorization.

243505434351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81168478120.

The product of its (nonzero) digits is 432000, while the sum is 39.

Adding to 243505434351 its reverse (153434505342), we get a palindrome (396939939693).

The spelling of 243505434351 in words is "two hundred forty-three billion, five hundred five million, four hundred thirty-four thousand, three hundred fifty-one".