12767681 has 2 divisors, whose sum is σ = 12767682. Its totient is φ = 12767680.

The previous prime is 12767669. The next prime is 12767683. The reversal of 12767681 is 18676721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 1343281 = 3380^2 + 1159^2 .

It is a cyclic number.

It is not a de Polignac number, because 12767681 - 2²² = 8573377 is a prime.

It is a super-2 number, since 2×12767681² = 326027356235522, which contains 22 as substring.

Together with 12767683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12767683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6383840 + 6383841.

It is an arithmetic number, because the mean of its divisors is an integer number (6383841).

Almost surely, 2^12767681 is an apocalyptic number.

It is an amenable number.

12767681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12767681 is an equidigital number, since it uses as much as digits as its factorization.

12767681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 12767681 is about 3573.1891917445. The cubic root of 12767681 is about 233.7243753545.

The spelling of 12767681 in words is "twelve million, seven hundred sixty-seven thousand, six hundred eighty-one".