6847121 has 2 divisors, whose sum is σ = 6847122. Its totient is φ = 6847120.

The previous prime is 6847091. The next prime is 6847147. The reversal of 6847121 is 1217486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4157521 + 2689600 = 2039^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 6847121 - 2¹⁰ = 6846097 is a prime.

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 (6844121) 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, 3423560 + 3423561.

It is an arithmetic number, because the mean of its divisors is an integer number (3423561).

Almost surely, 2^6847121 is an apocalyptic number.

It is an amenable number.

6847121 is a deficient number, since it is larger than the sum of its proper divisors (1).

6847121 is an equidigital number, since it uses as much as digits as its factorization.

6847121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 6847121 is about 2616.7004031795. The cubic root of 6847121 is about 189.8902505605.

The spelling of 6847121 in words is "six million, eight hundred forty-seven thousand, one hundred twenty-one".