12891641 has 8 divisors (see below), whose sum is σ = 14770944. Its totient is φ = 11021760.

The previous prime is 12891623. The next prime is 12891647. The reversal of 12891641 is 14619821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12891641 - 2¹⁰ = 12890617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12891598 and 12891607.

It is not an unprimeable number, because it can be changed into a prime (12891647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 881 + ... + 5153.

It is an arithmetic number, because the mean of its divisors is an integer number (1846368).

Almost surely, 2^12891641 is an apocalyptic number.

It is an amenable number.

12891641 is a deficient number, since it is larger than the sum of its proper divisors (1879303).

12891641 is an equidigital number, since it uses as much as digits as its factorization.

12891641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4711.

The product of its digits is 3456, while the sum is 32.

The square root of 12891641 is about 3590.4931416172. The cubic root of 12891641 is about 234.4783418880.

The spelling of 12891641 in words is "twelve million, eight hundred ninety-one thousand, six hundred forty-one".