1231543203 has 24 divisors (see below), whose sum is σ = 1867160400. Its totient is φ = 720646080.

The previous prime is 1231543193. The next prime is 1231543207. The reversal of 1231543203 is 3023451321.

It is not a de Polignac number, because 1231543203 - 2⁸ = 1231542947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231543207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47968 + ... + 69021.

It is an arithmetic number, because the mean of its divisors is an integer number (77798350).

Almost surely, 2^1231543203 is an apocalyptic number.

1231543203 is a deficient number, since it is larger than the sum of its proper divisors (635617197).

1231543203 is a wasteful number, since it uses less digits than its factorization.

1231543203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117043 (or 117032 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 1231543203 is about 35093.3498401050. The cubic root of 1231543203 is about 1071.8891722300.

Adding to 1231543203 its reverse (3023451321), we get a palindrome (4254994524).

The spelling of 1231543203 in words is "one billion, two hundred thirty-one million, five hundred forty-three thousand, two hundred three".