12647681 has 2 divisors, whose sum is σ = 12647682. Its totient is φ = 12647680.

The previous prime is 12647671. The next prime is 12647693. The reversal of 12647681 is 18674621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12567025 + 80656 = 3545^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 12647681 - 2⁶ = 12647617 is a prime.

It is a super-2 number, since 2×12647681² = 319927669355522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12647611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6323840 + 6323841.

It is an arithmetic number, because the mean of its divisors is an integer number (6323841).

Almost surely, 2^12647681 is an apocalyptic number.

It is an amenable number.

12647681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12647681 is an equidigital number, since it uses as much as digits as its factorization.

12647681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 12647681 is about 3556.3578278908. The cubic root of 12647681 is about 232.9898317506.

The spelling of 12647681 in words is "twelve million, six hundred forty-seven thousand, six hundred eighty-one".