12801681 has 6 divisors (see below), whose sum is σ = 18491330. Its totient is φ = 8534448.

The previous prime is 12801661. The next prime is 12801689. The reversal of 12801681 is 18610821.

It can be written as a sum of positive squares in only one way, i.e., 9979281 + 2822400 = 3159^2 + 1680^2 .

It is not a de Polignac number, because 12801681 - 2¹⁰ = 12800657 is a prime.

It is a super-2 number, since 2×12801681² = 327766072851522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12801689) 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, 711196 + ... + 711213.

Almost surely, 2^12801681 is an apocalyptic number.

It is an amenable number.

12801681 is a deficient number, since it is larger than the sum of its proper divisors (5689649).

12801681 is a wasteful number, since it uses less digits than its factorization.

12801681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422415 (or 1422412 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 12801681 is about 3577.9436831789. The cubic root of 12801681 is about 233.9316587626.

The spelling of 12801681 in words is "twelve million, eight hundred one thousand, six hundred eighty-one".