231205523 has 2 divisors, whose sum is σ = 231205524. Its totient is φ = 231205522.

The previous prime is 231205477. The next prime is 231205561. The reversal of 231205523 is 325502132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231205523 - 2¹⁴ = 231189139 is a prime.

It is not a weakly prime, because it can be changed into another prime (231205573) 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, 115602761 + 115602762.

It is an arithmetic number, because the mean of its divisors is an integer number (115602762).

Almost surely, 2^231205523 is an apocalyptic number.

231205523 is a deficient number, since it is larger than the sum of its proper divisors (1).

231205523 is an equidigital number, since it uses as much as digits as its factorization.

231205523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 231205523 is about 15205.4438606704. The cubic root of 231205523 is about 613.7611592138.

Adding to 231205523 its reverse (325502132), we get a palindrome (556707655).

The spelling of 231205523 in words is "two hundred thirty-one million, two hundred five thousand, five hundred twenty-three".