231309523 has 2 divisors, whose sum is σ = 231309524. Its totient is φ = 231309522.

The previous prime is 231309521. The next prime is 231309557. The reversal of 231309523 is 325903132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231309523 - 2¹ = 231309521 is a prime.

Together with 231309521, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 231309491 and 231309500.

It is not a weakly prime, because it can be changed into another prime (231309521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115654761 + 115654762.

It is an arithmetic number, because the mean of its divisors is an integer number (115654762).

Almost surely, 2^231309523 is an apocalyptic number.

231309523 is a deficient number, since it is larger than the sum of its proper divisors (1).

231309523 is an equidigital number, since it uses as much as digits as its factorization.

231309523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 231309523 is about 15208.8633040080. The cubic root of 231309523 is about 613.8531719987.

The spelling of 231309523 in words is "two hundred thirty-one million, three hundred nine thousand, five hundred twenty-three".