6894821 has 2 divisors, whose sum is σ = 6894822. Its totient is φ = 6894820.

The previous prime is 6894791. The next prime is 6894827. The reversal of 6894821 is 1284986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6630625 + 264196 = 2575^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 6894821 - 2⁶ = 6894757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6894827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3447410 + 3447411.

It is an arithmetic number, because the mean of its divisors is an integer number (3447411).

Almost surely, 2^6894821 is an apocalyptic number.

It is an amenable number.

6894821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6894821 is an equidigital number, since it uses as much as digits as its factorization.

6894821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 6894821 is about 2625.7991164596. The cubic root of 6894821 is about 190.3301830298.

The spelling of 6894821 in words is "six million, eight hundred ninety-four thousand, eight hundred twenty-one".