12315509 has 2 divisors, whose sum is σ = 12315510. Its totient is φ = 12315508.

The previous prime is 12315493. The next prime is 12315521. The reversal of 12315509 is 90551321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7409284 + 4906225 = 2722^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 12315509 - 2⁴ = 12315493 is a prime.

It is equal to p₈₀₇₄₁₆ and since 12315509 and 807416 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12315529) 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, 6157754 + 6157755.

It is an arithmetic number, because the mean of its divisors is an integer number (6157755).

Almost surely, 2^12315509 is an apocalyptic number.

It is an amenable number.

12315509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12315509 is an equidigital number, since it uses as much as digits as its factorization.

12315509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 12315509 is about 3509.3459504586. The cubic root of 12315509 is about 230.9320027495.

The spelling of 12315509 in words is "twelve million, three hundred fifteen thousand, five hundred nine".