243115404251 has 16 divisors (see below), whose sum is σ = 246240382080. Its totient is φ = 240016711680.

The previous prime is 243115404239. The next prime is 243115404269. The reversal of 243115404251 is 152404511342.

It is a cyclic number.

It is not a de Polignac number, because 243115404251 - 2¹⁰ = 243115403227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243115400251) 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 15 ways as a sum of consecutive naturals, for example, 13619390 + ... + 13637228.

It is an arithmetic number, because the mean of its divisors is an integer number (15390023880).

Almost surely, 2^243115404251 is an apocalyptic number.

243115404251 is a deficient number, since it is larger than the sum of its proper divisors (3124977829).

243115404251 is a wasteful number, since it uses less digits than its factorization.

243115404251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18566.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 243115404251 its reverse (152404511342), we get a palindrome (395519915593).

The spelling of 243115404251 in words is "two hundred forty-three billion, one hundred fifteen million, four hundred four thousand, two hundred fifty-one".