243115554551 has 4 divisors (see below), whose sum is σ = 243132081912. Its totient is φ = 243099027192.

The previous prime is 243115554547. The next prime is 243115554553. The reversal of 243115554551 is 155455511342.

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 243115554551 - 2² = 243115554547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243115554499 and 243115554508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243115554553) 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 3 ways as a sum of consecutive naturals, for example, 8241596 + ... + 8271041.

It is an arithmetic number, because the mean of its divisors is an integer number (60783020478).

Almost surely, 2^243115554551 is an apocalyptic number.

243115554551 is a deficient number, since it is larger than the sum of its proper divisors (16527361).

243115554551 is a wasteful number, since it uses less digits than its factorization.

243115554551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16527360.

The product of its digits is 300000, while the sum is 41.

The spelling of 243115554551 in words is "two hundred forty-three billion, one hundred fifteen million, five hundred fifty-four thousand, five hundred fifty-one".