12809761 has 2 divisors, whose sum is σ = 12809762. Its totient is φ = 12809760.

The previous prime is 12809759. The next prime is 12809791. The reversal of 12809761 is 16790821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 136161 = 3560^2 + 369^2 .

It is a cyclic number.

It is not a de Polignac number, because 12809761 - 2¹ = 12809759 is a prime.

Together with 12809759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12809701) 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 as a sum of consecutive naturals, namely, 6404880 + 6404881.

It is an arithmetic number, because the mean of its divisors is an integer number (6404881).

Almost surely, 2^12809761 is an apocalyptic number.

It is an amenable number.

12809761 is a deficient number, since it is larger than the sum of its proper divisors (1).

12809761 is an equidigital number, since it uses as much as digits as its factorization.

12809761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 12809761 is about 3579.0726452532. The cubic root of 12809761 is about 233.9808650679.

The spelling of 12809761 in words is "twelve million, eight hundred nine thousand, seven hundred sixty-one".