12205613 has 4 divisors (see below), whose sum is σ = 13949280. Its totient is φ = 10461948.

The previous prime is 12205601. The next prime is 12205621. The reversal of 12205613 is 31650221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31650221 = 109 ⋅290369.

It is a de Polignac number, because none of the positive numbers 2^k-12205613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12205213) 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, 871823 + ... + 871836.

It is an arithmetic number, because the mean of its divisors is an integer number (3487320).

Almost surely, 2^12205613 is an apocalyptic number.

It is an amenable number.

12205613 is a deficient number, since it is larger than the sum of its proper divisors (1743667).

12205613 is an equidigital number, since it uses as much as digits as its factorization.

12205613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743666.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 12205613 is about 3493.6532455297. The cubic root of 12205613 is about 230.2430511951.

Adding to 12205613 its reverse (31650221), we get a palindrome (43855834).

The spelling of 12205613 in words is "twelve million, two hundred five thousand, six hundred thirteen".