12723509 has 2 divisors, whose sum is σ = 12723510. Its totient is φ = 12723508.

The previous prime is 12723481. The next prime is 12723517. The reversal of 12723509 is 90532721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9132484 + 3591025 = 3022^2 + 1895^2 .

It is an emirp because it is prime and its reverse (90532721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12723509 - 2⁸ = 12723253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12723539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6361754 + 6361755.

It is an arithmetic number, because the mean of its divisors is an integer number (6361755).

Almost surely, 2^12723509 is an apocalyptic number.

It is an amenable number.

12723509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12723509 is an equidigital number, since it uses as much as digits as its factorization.

12723509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 12723509 is about 3567.0028034752. The cubic root of 12723509 is about 233.4545272901.

The spelling of 12723509 in words is "twelve million, seven hundred twenty-three thousand, five hundred nine".