6561673 has 2 divisors, whose sum is σ = 6561674. Its totient is φ = 6561672.

The previous prime is 6561649. The next prime is 6561679. The reversal of 6561673 is 3761656.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5004169 + 1557504 = 2237^2 + 1248^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561673 - 2⁹ = 6561161 is a prime.

It is not a weakly prime, because it can be changed into another prime (6561679) 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, 3280836 + 3280837.

It is an arithmetic number, because the mean of its divisors is an integer number (3280837).

Almost surely, 2^6561673 is an apocalyptic number.

It is an amenable number.

6561673 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561673 is an equidigital number, since it uses as much as digits as its factorization.

6561673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 6561673 is about 2561.5762725322. The cubic root of 6561673 is about 187.2139448454.

The spelling of 6561673 in words is "six million, five hundred sixty-one thousand, six hundred seventy-three".