12661291 has 4 divisors (see below), whose sum is σ = 12668584. Its totient is φ = 12654000.

The previous prime is 12661273. The next prime is 12661301. The reversal of 12661291 is 19216621.

12661291 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 brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12661291 - 2⁹ = 12660779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12661211) 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, 631 + ... + 5071.

It is an arithmetic number, because the mean of its divisors is an integer number (3167146).

Almost surely, 2^12661291 is an apocalyptic number.

12661291 is a deficient number, since it is larger than the sum of its proper divisors (7293).

12661291 is an equidigital number, since it uses as much as digits as its factorization.

12661291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7292.

The product of its digits is 1296, while the sum is 28.

The square root of 12661291 is about 3558.2707878968. The cubic root of 12661291 is about 233.0733742032.

The spelling of 12661291 in words is "twelve million, six hundred sixty-one thousand, two hundred ninety-one".