6920681 has 2 divisors, whose sum is σ = 6920682. Its totient is φ = 6920680.

The previous prime is 6920651. The next prime is 6920707. The reversal of 6920681 is 1860296.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4000000 + 2920681 = 2000^2 + 1709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6920681 is a prime.

It is a super-2 number, since 2×6920681² = 95791651007522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6920651) 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, 3460340 + 3460341.

It is an arithmetic number, because the mean of its divisors is an integer number (3460341).

Almost surely, 2^6920681 is an apocalyptic number.

It is an amenable number.

6920681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6920681 is an equidigital number, since it uses as much as digits as its factorization.

6920681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 6920681 is about 2630.7187230869. The cubic root of 6920681 is about 190.5678395669.

The spelling of 6920681 in words is "six million, nine hundred twenty thousand, six hundred eighty-one".