243205897 has 4 divisors (see below), whose sum is σ = 265315536. Its totient is φ = 221096260.

The previous prime is 243205883. The next prime is 243205931. The reversal of 243205897 is 798502342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 243205897 - 2¹⁵ = 243173129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243205867) 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, 11054803 + ... + 11054824.

It is an arithmetic number, because the mean of its divisors is an integer number (66328884).

Almost surely, 2^243205897 is an apocalyptic number.

It is an amenable number.

243205897 is a deficient number, since it is larger than the sum of its proper divisors (22109639).

243205897 is a wasteful number, since it uses less digits than its factorization.

243205897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22109638.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 243205897 is about 15595.0600191214. The cubic root of 243205897 is about 624.2013453158.

The spelling of 243205897 in words is "two hundred forty-three million, two hundred five thousand, eight hundred ninety-seven".