243306361 has 4 divisors (see below), whose sum is σ = 245814772. Its totient is φ = 240797952.

The previous prime is 243306319. The next prime is 243306367. The reversal of 243306361 is 163603342.

243306361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67240000 + 176066361 = 8200^2 + 13269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243306361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243306367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254060 + ... + 1254253.

It is an arithmetic number, because the mean of its divisors is an integer number (61453693).

Almost surely, 2^243306361 is an apocalyptic number.

It is an amenable number.

243306361 is a deficient number, since it is larger than the sum of its proper divisors (2508411).

243306361 is an equidigital number, since it uses as much as digits as its factorization.

243306361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508410.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 243306361 is about 15598.2807065394. The cubic root of 243306361 is about 624.2872822825.

The spelling of 243306361 in words is "two hundred forty-three million, three hundred six thousand, three hundred sixty-one".