243104213551 has 4 divisors (see below), whose sum is σ = 243371068704. Its totient is φ = 242837358400.

The previous prime is 243104213543. The next prime is 243104213567. The reversal of 243104213551 is 155312401342.

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 243104213551 - 2³ = 243104213543 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 (243104213531) 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, 133426210 + ... + 133428031.

It is an arithmetic number, because the mean of its divisors is an integer number (60842767176).

Almost surely, 2^243104213551 is an apocalyptic number.

243104213551 is a deficient number, since it is larger than the sum of its proper divisors (266855153).

243104213551 is an equidigital number, since it uses as much as digits as its factorization.

243104213551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266855152.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 243104213551 its reverse (155312401342), we get a palindrome (398416614893).

The spelling of 243104213551 in words is "two hundred forty-three billion, one hundred four million, two hundred thirteen thousand, five hundred fifty-one".