203313243 has 16 divisors (see below), whose sum is σ = 326117120. Its totient is φ = 110064096.

The previous prime is 203313239. The next prime is 203313269. The reversal of 203313243 is 342313302.

It is not a de Polignac number, because 203313243 - 2² = 203313239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (203313203) 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 15 ways as a sum of consecutive naturals, for example, 254380 + ... + 255177.

It is an arithmetic number, because the mean of its divisors is an integer number (20382320).

Almost surely, 2^203313243 is an apocalyptic number.

203313243 is a deficient number, since it is larger than the sum of its proper divisors (122803877).

203313243 is a wasteful number, since it uses less digits than its factorization.

203313243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509586.

The product of its (nonzero) digits is 1296, while the sum is 21.

The square root of 203313243 is about 14258.7952857175. The cubic root of 203313243 is about 588.0152044983.

Adding to 203313243 its reverse (342313302), we get a palindrome (545626545).

The spelling of 203313243 in words is "two hundred three million, three hundred thirteen thousand, two hundred forty-three".