243320345 has 4 divisors (see below), whose sum is σ = 291984420. Its totient is φ = 194656272.

The previous prime is 243320339. The next prime is 243320351. The reversal of 243320345 is 543023342.

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

It is an interprime number because it is at equal distance from previous prime (243320339) and next prime (243320351).

It can be written as a sum of positive squares in 2 ways, for example, as 123899161 + 119421184 = 11131^2 + 10928^2 .

It is a cyclic number.

It is not a de Polignac number, because 243320345 - 2¹⁴ = 243303961 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24332030 + ... + 24332039.

It is an arithmetic number, because the mean of its divisors is an integer number (72996105).

Almost surely, 2^243320345 is an apocalyptic number.

It is an amenable number.

243320345 is a deficient number, since it is larger than the sum of its proper divisors (48664075).

243320345 is an equidigital number, since it uses as much as digits as its factorization.

243320345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48664074.

The product of its (nonzero) digits is 8640, while the sum is 26.

The square root of 243320345 is about 15598.7289546296. The cubic root of 243320345 is about 624.2992423289.

Adding to 243320345 its reverse (543023342), we get a palindrome (786343687).

The spelling of 243320345 in words is "two hundred forty-three million, three hundred twenty thousand, three hundred forty-five".