12777643 has 2 divisors, whose sum is σ = 12777644. Its totient is φ = 12777642.

The previous prime is 12777629. The next prime is 12777649. The reversal of 12777643 is 34677721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12777643 - 2¹³ = 12769451 is a prime.

It is not a weakly prime, because it can be changed into another prime (12777649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6388821 + 6388822.

It is an arithmetic number, because the mean of its divisors is an integer number (6388822).

Almost surely, 2^12777643 is an apocalyptic number.

12777643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12777643 is an equidigital number, since it uses as much as digits as its factorization.

12777643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 37.

The square root of 12777643 is about 3574.5829127326. The cubic root of 12777643 is about 233.7851474692.

The spelling of 12777643 in words is "twelve million, seven hundred seventy-seven thousand, six hundred forty-three".