243123224551 has 4 divisors (see below), whose sum is σ = 243130188400. Its totient is φ = 243116260704.

The previous prime is 243123224527. The next prime is 243123224569. The reversal of 243123224551 is 155422321342.

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

It is a cyclic number.

It is not a de Polignac number, because 243123224551 - 2¹³ = 243123216359 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 (243123224501) 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, 3429291 + ... + 3499468.

It is an arithmetic number, because the mean of its divisors is an integer number (60782547100).

Almost surely, 2^243123224551 is an apocalyptic number.

243123224551 is a deficient number, since it is larger than the sum of its proper divisors (6963849).

243123224551 is an equidigital number, since it uses as much as digits as its factorization.

243123224551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963848.

The product of its digits is 57600, while the sum is 34.

Adding to 243123224551 its reverse (155422321342), we get a palindrome (398545545893).

The spelling of 243123224551 in words is "two hundred forty-three billion, one hundred twenty-three million, two hundred twenty-four thousand, five hundred fifty-one".