12891194 has 4 divisors (see below), whose sum is σ = 19336794. Its totient is φ = 6445596.

The previous prime is 12891187. The next prime is 12891209. The reversal of 12891194 is 49119821.

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

It can be written as a sum of positive squares in only one way, i.e., 11135569 + 1755625 = 3337^2 + 1325^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222797 + ... + 3222800.

Almost surely, 2^12891194 is an apocalyptic number.

12891194 is a deficient number, since it is larger than the sum of its proper divisors (6445600).

12891194 is an equidigital number, since it uses as much as digits as its factorization.

12891194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445599.

The product of its digits is 5184, while the sum is 35.

The square root of 12891194 is about 3590.4308933609. The cubic root of 12891194 is about 234.4756317848.

The spelling of 12891194 in words is "twelve million, eight hundred ninety-one thousand, one hundred ninety-four".