205590243 has 4 divisors (see below), whose sum is σ = 274120328. Its totient is φ = 137060160.

The previous prime is 205590199. The next prime is 205590257. The reversal of 205590243 is 342095502.

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

It is not a de Polignac number, because 205590243 - 2⁶ = 205590179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205590243.

It is not an unprimeable number, because it can be changed into a prime (205592243) 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, 34265038 + ... + 34265043.

It is an arithmetic number, because the mean of its divisors is an integer number (68530082).

Almost surely, 2^205590243 is an apocalyptic number.

205590243 is a deficient number, since it is larger than the sum of its proper divisors (68530085).

205590243 is an equidigital number, since it uses as much as digits as its factorization.

205590243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68530084.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 205590243 is about 14338.4184274278. The cubic root of 205590243 is about 590.2022125984.

The spelling of 205590243 in words is "two hundred five million, five hundred ninety thousand, two hundred forty-three".