231405563 has 2 divisors, whose sum is σ = 231405564. Its totient is φ = 231405562.

The previous prime is 231405527. The next prime is 231405571. The reversal of 231405563 is 365504132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231405563 - 2¹⁶ = 231340027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (231405593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115702781 + 115702782.

It is an arithmetic number, because the mean of its divisors is an integer number (115702782).

Almost surely, 2^231405563 is an apocalyptic number.

231405563 is a deficient number, since it is larger than the sum of its proper divisors (1).

231405563 is an equidigital number, since it uses as much as digits as its factorization.

231405563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 231405563 is about 15212.0203457660. The cubic root of 231405563 is about 613.9381177753.

Adding to 231405563 its reverse (365504132), we get a palindrome (596909695).

The spelling of 231405563 in words is "two hundred thirty-one million, four hundred five thousand, five hundred sixty-three".