6776813 has 2 divisors, whose sum is σ = 6776814. Its totient is φ = 6776812.

The previous prime is 6776779. The next prime is 6776873. The reversal of 6776813 is 3186776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6165289 + 611524 = 2483^2 + 782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6776813 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6776873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3388406 + 3388407.

It is an arithmetic number, because the mean of its divisors is an integer number (3388407).

Almost surely, 2^6776813 is an apocalyptic number.

It is an amenable number.

6776813 is a deficient number, since it is larger than the sum of its proper divisors (1).

6776813 is an equidigital number, since it uses as much as digits as its factorization.

6776813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The square root of 6776813 is about 2603.2312613366. The cubic root of 6776813 is about 189.2380658584.

The spelling of 6776813 in words is "six million, seven hundred seventy-six thousand, eight hundred thirteen".