12533509 has 2 divisors, whose sum is σ = 12533510. Its totient is φ = 12533508.

The previous prime is 12533501. The next prime is 12533513. The reversal of 12533509 is 90533521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9941409 + 2592100 = 3153^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 12533509 - 2³ = 12533501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12533501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6266754 + 6266755.

It is an arithmetic number, because the mean of its divisors is an integer number (6266755).

Almost surely, 2^12533509 is an apocalyptic number.

It is an amenable number.

12533509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12533509 is an equidigital number, since it uses as much as digits as its factorization.

12533509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 12533509 is about 3540.2696225005. The cubic root of 12533509 is about 232.2866366472.

The spelling of 12533509 in words is "twelve million, five hundred thirty-three thousand, five hundred nine".