243219948217 has 4 divisors (see below), whose sum is σ = 243220934736. Its totient is φ = 243218961700.

The previous prime is 243219948163. The next prime is 243219948229. The reversal of 243219948217 is 712849912342.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243219948217 is a prime.

It is a super-3 number, since 3×243219948217³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243219948247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232842 + ... + 735292.

It is an arithmetic number, because the mean of its divisors is an integer number (60805233684).

Almost surely, 2^243219948217 is an apocalyptic number.

It is an amenable number.

243219948217 is a deficient number, since it is larger than the sum of its proper divisors (986519).

243219948217 is an equidigital number, since it uses as much as digits as its factorization.

243219948217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986518.

The product of its digits is 1741824, while the sum is 52.

The spelling of 243219948217 in words is "two hundred forty-three billion, two hundred nineteen million, nine hundred forty-eight thousand, two hundred seventeen".