12661361 has 4 divisors (see below), whose sum is σ = 13069824. Its totient is φ = 12252900.

The previous prime is 12661357. The next prime is 12661373. The reversal of 12661361 is 16316621.

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 12661361 - 2² = 12661357 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 12661361.

It is not an unprimeable number, because it can be changed into a prime (12661301) 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, 204185 + ... + 204246.

It is an arithmetic number, because the mean of its divisors is an integer number (3267456).

Almost surely, 2^12661361 is an apocalyptic number.

It is an amenable number.

12661361 is a deficient number, since it is larger than the sum of its proper divisors (408463).

12661361 is an equidigital number, since it uses as much as digits as its factorization.

12661361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408462.

The product of its digits is 1296, while the sum is 26.

The square root of 12661361 is about 3558.2806241217. The cubic root of 12661361 is about 233.0738037304.

Adding to 12661361 its reverse (16316621), we get a palindrome (28977982).

The spelling of 12661361 in words is "twelve million, six hundred sixty-one thousand, three hundred sixty-one".