12685613 has 4 divisors (see below), whose sum is σ = 12693468. Its totient is φ = 12677760.

The previous prime is 12685609. The next prime is 12685619. The reversal of 12685613 is 31658621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31658621 = 43 ⋅736247.

It can be written as a sum of positive squares in 2 ways, for example, as 7963684 + 4721929 = 2822^2 + 2173^2 .

It is a cyclic number.

It is not a de Polignac number, because 12685613 - 2² = 12685609 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 12685613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12685619) 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, 518 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (3173367).

Almost surely, 2^12685613 is an apocalyptic number.

It is an amenable number.

12685613 is a deficient number, since it is larger than the sum of its proper divisors (7855).

12685613 is an equidigital number, since it uses as much as digits as its factorization.

12685613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7854.

The product of its digits is 8640, while the sum is 32.

The square root of 12685613 is about 3561.6868194719. The cubic root of 12685613 is about 233.2225213056. Note that the first 3 decimals are identical.

The spelling of 12685613 in words is "twelve million, six hundred eighty-five thousand, six hundred thirteen".