243015199 has 4 divisors (see below), whose sum is σ = 277731664. Its totient is φ = 208298736.

The previous prime is 243015197. The next prime is 243015257. The reversal of 243015199 is 991510342.

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 243015199 - 2¹ = 243015197 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243015193) by changing a digit.

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, 17358222 + ... + 17358235.

It is an arithmetic number, because the mean of its divisors is an integer number (69432916).

Almost surely, 2^243015199 is an apocalyptic number.

243015199 is a deficient number, since it is larger than the sum of its proper divisors (34716465).

243015199 is an equidigital number, since it uses as much as digits as its factorization.

243015199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34716464.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 243015199 is about 15588.9447686494. The cubic root of 243015199 is about 624.0381570122.

The spelling of 243015199 in words is "two hundred forty-three million, fifteen thousand, one hundred ninety-nine".