243210155 has 16 divisors (see below), whose sum is σ = 300119904. Its totient is φ = 189093120.

The previous prime is 243210131. The next prime is 243210161. The reversal of 243210155 is 551012342.

It is not a de Polignac number, because 243210155 - 2¹⁶ = 243144619 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 243210155.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 54644 + ... + 58926.

It is an arithmetic number, because the mean of its divisors is an integer number (18757494).

Almost surely, 2^243210155 is an apocalyptic number.

243210155 is a deficient number, since it is larger than the sum of its proper divisors (56909749).

243210155 is a wasteful number, since it uses less digits than its factorization.

243210155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4606.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 243210155 is about 15595.1965361133. The cubic root of 243210155 is about 624.2049880918.

Adding to 243210155 its reverse (551012342), we get a palindrome (794222497).

The spelling of 243210155 in words is "two hundred forty-three million, two hundred ten thousand, one hundred fifty-five".