243000225551 has 4 divisors (see below), whose sum is σ = 244233729432. Its totient is φ = 241766721672.

The previous prime is 243000225547. The next prime is 243000225599. The reversal of 243000225551 is 155522000342.

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 243000225551 - 2² = 243000225547 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 (243000225151) 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, 616751645 + ... + 616752038.

It is an arithmetic number, because the mean of its divisors is an integer number (61058432358).

Almost surely, 2^243000225551 is an apocalyptic number.

243000225551 is a deficient number, since it is larger than the sum of its proper divisors (1233503881).

243000225551 is a wasteful number, since it uses less digits than its factorization.

243000225551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233503880.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 243000225551 its reverse (155522000342), we get a palindrome (398522225893).

The spelling of 243000225551 in words is "two hundred forty-three billion, two hundred twenty-five thousand, five hundred fifty-one".