243540555 has 16 divisors (see below), whose sum is σ = 412586784. Its totient is φ = 122247680.

The previous prime is 243540527. The next prime is 243540559. The reversal of 243540555 is 555045342.

It is not a de Polignac number, because 243540555 - 2⁵ = 243540523 is a prime.

It is a super-3 number, since 3×243540555³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (243540559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477276 + ... + 477785.

It is an arithmetic number, because the mean of its divisors is an integer number (25786674).

Almost surely, 2^243540555 is an apocalyptic number.

243540555 is a deficient number, since it is larger than the sum of its proper divisors (169046229).

243540555 is a wasteful number, since it uses less digits than its factorization.

243540555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955086.

The product of its (nonzero) digits is 60000, while the sum is 33.

The square root of 243540555 is about 15605.7859462444. The cubic root of 243540555 is about 624.4875201646.

Adding to 243540555 its reverse (555045342), we get a palindrome (798585897).

The spelling of 243540555 in words is "two hundred forty-three million, five hundred forty thousand, five hundred fifty-five".