12309617 has 4 divisors (see below), whose sum is σ = 12511476. Its totient is φ = 12107760.

The previous prime is 12309613. The next prime is 12309631. The reversal of 12309617 is 71690321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6885376 + 5424241 = 2624^2 + 2329^2 .

It is a cyclic number.

It is not a de Polignac number, because 12309617 - 2² = 12309613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12309617.

It is not an unprimeable number, because it can be changed into a prime (12309613) 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, 100838 + ... + 100959.

It is an arithmetic number, because the mean of its divisors is an integer number (3127869).

Almost surely, 2^12309617 is an apocalyptic number.

It is an amenable number.

12309617 is a deficient number, since it is larger than the sum of its proper divisors (201859).

12309617 is an equidigital number, since it uses as much as digits as its factorization.

12309617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201858.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 12309617 is about 3508.5063773635. The cubic root of 12309617 is about 230.8951692900.

Adding to 12309617 its reverse (71690321), we get a palindrome (83999938).

The spelling of 12309617 in words is "twelve million, three hundred nine thousand, six hundred seventeen".