203042243 has 4 divisors (see below), whose sum is σ = 205135560. Its totient is φ = 200948928.

The previous prime is 203042239. The next prime is 203042249. The reversal of 203042243 is 342240302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342240302 = 2 ⋅171120151.

It is a cyclic number.

It is not a de Polignac number, because 203042243 - 2² = 203042239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203042249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046513 + ... + 1046706.

It is an arithmetic number, because the mean of its divisors is an integer number (51283890).

Almost surely, 2^203042243 is an apocalyptic number.

203042243 is a deficient number, since it is larger than the sum of its proper divisors (2093317).

203042243 is an equidigital number, since it uses as much as digits as its factorization.

203042243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093316.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 203042243 is about 14249.2892103431. The cubic root of 203042243 is about 587.7538295354.

Adding to 203042243 its reverse (342240302), we get a palindrome (545282545).

The spelling of 203042243 in words is "two hundred three million, forty-two thousand, two hundred forty-three".