231213554503 has 4 divisors (see below), whose sum is σ = 231290603008. Its totient is φ = 231136506000.

The previous prime is 231213554459. The next prime is 231213554573. The reversal of 231213554503 is 305455312132.

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

It is a cyclic number.

It is not a de Polignac number, because 231213554503 - 2²⁵ = 231180000071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231213554573) 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 3 ways as a sum of consecutive naturals, for example, 38519751 + ... + 38525752.

It is an arithmetic number, because the mean of its divisors is an integer number (57822650752).

Almost surely, 2^231213554503 is an apocalyptic number.

231213554503 is a deficient number, since it is larger than the sum of its proper divisors (77048505).

231213554503 is an equidigital number, since it uses as much as digits as its factorization.

231213554503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77048504.

The product of its (nonzero) digits is 54000, while the sum is 34.

Adding to 231213554503 its reverse (305455312132), we get a palindrome (536668866635).

The spelling of 231213554503 in words is "two hundred thirty-one billion, two hundred thirteen million, five hundred fifty-four thousand, five hundred three".