243121244551 has 8 divisors (see below), whose sum is σ = 249087200544. Its totient is φ = 237225891840.

The previous prime is 243121244417. The next prime is 243121244557. The reversal of 243121244551 is 155442121342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243121244551 - 2¹⁵ = 243121211783 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 (243121244557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17643850 + ... + 17657623.

It is an arithmetic number, because the mean of its divisors is an integer number (31135900068).

Almost surely, 2^243121244551 is an apocalyptic number.

243121244551 is a deficient number, since it is larger than the sum of its proper divisors (5965955993).

243121244551 is an equidigital number, since it uses as much as digits as its factorization.

243121244551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35301641.

The product of its digits is 38400, while the sum is 34.

Adding to 243121244551 its reverse (155442121342), we get a palindrome (398563365893).

The spelling of 243121244551 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-four thousand, five hundred fifty-one".