12891485 has 4 divisors (see below), whose sum is σ = 15469788. Its totient is φ = 10313184.

The previous prime is 12891479. The next prime is 12891493. The reversal of 12891485 is 58419821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5692996 + 7198489 = 2386^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 12891485 - 2⁴ = 12891469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1289144 + ... + 1289153.

It is an arithmetic number, because the mean of its divisors is an integer number (3867447).

Almost surely, 2^12891485 is an apocalyptic number.

It is an amenable number.

12891485 is a deficient number, since it is larger than the sum of its proper divisors (2578303).

12891485 is an equidigital number, since it uses as much as digits as its factorization.

12891485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578302.

The product of its digits is 23040, while the sum is 38.

The square root of 12891485 is about 3590.4714175161. The cubic root of 12891485 is about 234.4773960873.

The spelling of 12891485 in words is "twelve million, eight hundred ninety-one thousand, four hundred eighty-five".