243246155 has 4 divisors (see below), whose sum is σ = 291895392. Its totient is φ = 194596920.

The previous prime is 243246127. The next prime is 243246161. The reversal of 243246155 is 551642342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551642342 = 2 ⋅275821171.

It is not a de Polignac number, because 243246155 - 2¹⁴ = 243229771 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24324611 + ... + 24324620.

It is an arithmetic number, because the mean of its divisors is an integer number (72973848).

Almost surely, 2^243246155 is an apocalyptic number.

243246155 is a deficient number, since it is larger than the sum of its proper divisors (48649237).

243246155 is an equidigital number, since it uses as much as digits as its factorization.

243246155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48649236.

The product of its digits is 28800, while the sum is 32.

The square root of 243246155 is about 15596.3506949543. The cubic root of 243246155 is about 624.2357848746.

Adding to 243246155 its reverse (551642342), we get a palindrome (794888497).

The spelling of 243246155 in words is "two hundred forty-three million, two hundred forty-six thousand, one hundred fifty-five".