231303505503 has 32 divisors (see below), whose sum is σ = 374744240640. Its totient is φ = 123882301440.

The previous prime is 231303505457. The next prime is 231303505523. The reversal of 231303505503 is 305505303132.

It is not a de Polignac number, because 231303505503 - 2⁶ = 231303505439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231303505523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1258173 + ... + 1430246.

It is an arithmetic number, because the mean of its divisors is an integer number (11710757520).

Almost surely, 2^231303505503 is an apocalyptic number.

231303505503 is a deficient number, since it is larger than the sum of its proper divisors (143440735137).

231303505503 is a wasteful number, since it uses less digits than its factorization.

231303505503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688687.

The product of its (nonzero) digits is 20250, while the sum is 30.

Adding to 231303505503 its reverse (305505303132), we get a palindrome (536808808635).

The spelling of 231303505503 in words is "two hundred thirty-one billion, three hundred three million, five hundred five thousand, five hundred three".