12722681 has 8 divisors (see below), whose sum is σ = 13502664. Its totient is φ = 11946240.

The previous prime is 12722653. The next prime is 12722683. The reversal of 12722681 is 18622721.

It can be written as a sum of positive squares in 4 ways, for example, as 7812025 + 4910656 = 2795^2 + 2216^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12722681 - 2¹⁸ = 12460537 is a prime.

It is a super-2 number, since 2×12722681² = 323733223655522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12722683) 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 7 ways as a sum of consecutive naturals, for example, 11951 + ... + 12971.

It is an arithmetic number, because the mean of its divisors is an integer number (1687833).

Almost surely, 2^12722681 is an apocalyptic number.

It is an amenable number.

12722681 is a deficient number, since it is larger than the sum of its proper divisors (779983).

12722681 is a wasteful number, since it uses less digits than its factorization.

12722681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771.

The product of its digits is 2688, while the sum is 29.

The square root of 12722681 is about 3566.8867377589. The cubic root of 12722681 is about 233.4494630545.

The spelling of 12722681 in words is "twelve million, seven hundred twenty-two thousand, six hundred eighty-one".