12891969 has 6 divisors (see below), whose sum is σ = 18621746. Its totient is φ = 8594640.

The previous prime is 12891953. The next prime is 12891971. The reversal of 12891969 is 96919821.

It can be written as a sum of positive squares in only one way, i.e., 12873744 + 18225 = 3588^2 + 135^2 .

It is not a de Polignac number, because 12891969 - 2⁴ = 12891953 is a prime.

It is a super-2 number, since 2×12891969² = 332405729393922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12891929) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 716212 + ... + 716229.

Almost surely, 2^12891969 is an apocalyptic number.

It is an amenable number.

12891969 is a deficient number, since it is larger than the sum of its proper divisors (5729777).

12891969 is a wasteful number, since it uses less digits than its factorization.

12891969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432447 (or 1432444 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 12891969 is about 3590.5388175036. The cubic root of 12891969 is about 234.4803304697.

The spelling of 12891969 in words is "twelve million, eight hundred ninety-one thousand, nine hundred sixty-nine".