243213417324731 has 4 divisors (see below), whose sum is σ = 277958191228272. Its totient is φ = 208468643421192.

The previous prime is 243213417324679. The next prime is 243213417324803. The reversal of 243213417324731 is 137423714312342.

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

It is a de Polignac number, because none of the positive numbers 2^k-243213417324731 is a prime.

It is a super-2 number, since 2×243213417324731² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243213417324931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17372386951760 + ... + 17372386951773.

It is an arithmetic number, because the mean of its divisors is an integer number (69489547807068).

Almost surely, 2^{243213417324731} is an apocalyptic number.

243213417324731 is a deficient number, since it is larger than the sum of its proper divisors (34744773903541).

243213417324731 is an equidigital number, since it uses as much as digits as its factorization.

243213417324731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34744773903540.

The product of its digits is 2032128, while the sum is 47.

The spelling of 243213417324731 in words is "two hundred forty-three trillion, two hundred thirteen billion, four hundred seventeen million, three hundred twenty-four thousand, seven hundred thirty-one".