12315309 has 4 divisors (see below), whose sum is σ = 16420416. Its totient is φ = 8210204.

The previous prime is 12315301. The next prime is 12315323. The reversal of 12315309 is 90351321.

It is a happy number.

12315309 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12315309 - 2³ = 12315301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12315301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052549 + ... + 2052554.

It is an arithmetic number, because the mean of its divisors is an integer number (4105104).

Almost surely, 2^12315309 is an apocalyptic number.

It is an amenable number.

12315309 is a deficient number, since it is larger than the sum of its proper divisors (4105107).

12315309 is an equidigital number, since it uses as much as digits as its factorization.

12315309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105106.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 12315309 is about 3509.3174550046. The cubic root of 12315309 is about 230.9307526549.

The spelling of 12315309 in words is "twelve million, three hundred fifteen thousand, three hundred nine".