243397205 has 4 divisors (see below), whose sum is σ = 292076652. Its totient is φ = 194717760.

The previous prime is 243397199. The next prime is 243397223. The reversal of 243397205 is 502793342.

243397205 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, and also an emirpimes, since its reverse is a distinct semiprime: 502793342 = 2 ⋅251396671.

It can be written as a sum of positive squares in 2 ways, for example, as 112317604 + 131079601 = 10598^2 + 11449^2 .

It is a de Polignac number, because none of the positive numbers 2^k-243397205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24339716 + ... + 24339725.

It is an arithmetic number, because the mean of its divisors is an integer number (73019163).

Almost surely, 2^243397205 is an apocalyptic number.

It is an amenable number.

243397205 is a deficient number, since it is larger than the sum of its proper divisors (48679447).

243397205 is an equidigital number, since it uses as much as digits as its factorization.

243397205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48679446.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 243397205 is about 15601.1924223759. The cubic root of 243397205 is about 624.3649699308.

The spelling of 243397205 in words is "two hundred forty-three million, three hundred ninety-seven thousand, two hundred five".