231503563 has 2 divisors, whose sum is σ = 231503564. Its totient is φ = 231503562.

The previous prime is 231503557. The next prime is 231503599. The reversal of 231503563 is 365305132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231503563 - 2²⁵ = 197949131 is a prime.

It is not a weakly prime, because it can be changed into another prime (231503963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115751781 + 115751782.

It is an arithmetic number, because the mean of its divisors is an integer number (115751782).

Almost surely, 2^231503563 is an apocalyptic number.

231503563 is a deficient number, since it is larger than the sum of its proper divisors (1).

231503563 is an equidigital number, since it uses as much as digits as its factorization.

231503563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 28.

The square root of 231503563 is about 15215.2411416974. The cubic root of 231503563 is about 614.0247729150.

Adding to 231503563 its reverse (365305132), we get a palindrome (596808695).

The spelling of 231503563 in words is "two hundred thirty-one million, five hundred three thousand, five hundred sixty-three".