231551431521503 has 2 divisors, whose sum is σ = 231551431521504. Its totient is φ = 231551431521502.

The previous prime is 231551431521469. The next prime is 231551431521563. The reversal of 231551431521503 is 305125134155132.

231551431521503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231551431521503 - 2⁶ = 231551431521439 is a prime.

It is a super-2 number, since 2×231551431521503² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231551431521563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115775715760751 + 115775715760752.

It is an arithmetic number, because the mean of its divisors is an integer number (115775715760752).

Almost surely, 2^{231551431521503} is an apocalyptic number.

231551431521503 is a deficient number, since it is larger than the sum of its proper divisors (1).

231551431521503 is an equidigital number, since it uses as much as digits as its factorization.

231551431521503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270000, while the sum is 41.

Adding to 231551431521503 its reverse (305125134155132), we get a palindrome (536676565676635).

The spelling of 231551431521503 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, four hundred thirty-one million, five hundred twenty-one thousand, five hundred three".