12009523 has 2 divisors, whose sum is σ = 12009524. Its totient is φ = 12009522.

The previous prime is 12009521. The next prime is 12009541. The reversal of 12009523 is 32590021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12009523 - 2¹ = 12009521 is a prime.

Together with 12009521, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12009494 and 12009503.

It is not a weakly prime, because it can be changed into another prime (12009521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6004761 + 6004762.

It is an arithmetic number, because the mean of its divisors is an integer number (6004762).

Almost surely, 2^12009523 is an apocalyptic number.

12009523 is a deficient number, since it is larger than the sum of its proper divisors (1).

12009523 is an equidigital number, since it uses as much as digits as its factorization.

12009523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 12009523 is about 3465.4758691989. The cubic root of 12009523 is about 229.0033942404.

Adding to 12009523 its reverse (32590021), we get a palindrome (44599544).

The spelling of 12009523 in words is "twelve million, nine thousand, five hundred twenty-three".