12899681 has 4 divisors (see below), whose sum is σ = 12940692. Its totient is φ = 12858672.

The previous prime is 12899671. The next prime is 12899687. The reversal of 12899681 is 18699821.

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 2531281 + 10368400 = 1591^2 + 3220^2 .

It is a cyclic number.

It is not a de Polignac number, because 12899681 - 2¹⁰ = 12898657 is a prime.

It is a super-2 number, since 2×12899681² = 332803539803522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12899687) 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 3 ways as a sum of consecutive naturals, for example, 20030 + ... + 20663.

It is an arithmetic number, because the mean of its divisors is an integer number (3235173).

Almost surely, 2^12899681 is an apocalyptic number.

It is an amenable number.

12899681 is a deficient number, since it is larger than the sum of its proper divisors (41011).

12899681 is an equidigital number, since it uses as much as digits as its factorization.

12899681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41010.

The product of its digits is 62208, while the sum is 44.

The square root of 12899681 is about 3591.6125904669. The cubic root of 12899681 is about 234.5270766740.

The spelling of 12899681 in words is "twelve million, eight hundred ninety-nine thousand, six hundred eighty-one".