243003155 has 4 divisors (see below), whose sum is σ = 291603792. Its totient is φ = 194402520.

The previous prime is 243003149. The next prime is 243003157. The reversal of 243003155 is 551300342.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 243003155 - 2⁶ = 243003091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243003155.

It is not an unprimeable number, because it can be changed into a prime (243003157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24300311 + ... + 24300320.

It is an arithmetic number, because the mean of its divisors is an integer number (72900948).

Almost surely, 2^243003155 is an apocalyptic number.

243003155 is a deficient number, since it is larger than the sum of its proper divisors (48600637).

243003155 is an equidigital number, since it uses as much as digits as its factorization.

243003155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48600636.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 243003155 is about 15588.5584644636. The cubic root of 243003155 is about 624.0278475888.

Adding to 243003155 its reverse (551300342), we get a palindrome (794303497).

The spelling of 243003155 in words is "two hundred forty-three million, three thousand, one hundred fifty-five".