6621847 has 2 divisors, whose sum is σ = 6621848. Its totient is φ = 6621846.

The previous prime is 6621841. The next prime is 6621851. The reversal of 6621847 is 7481266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6621847 - 2¹¹ = 6619799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6621841) 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, 3310923 + 3310924.

It is an arithmetic number, because the mean of its divisors is an integer number (3310924).

Almost surely, 2^6621847 is an apocalyptic number.

6621847 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621847 is an equidigital number, since it uses as much as digits as its factorization.

6621847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 6621847 is about 2573.2949694895. The cubic root of 6621847 is about 187.7844878410.

The spelling of 6621847 in words is "six million, six hundred twenty-one thousand, eight hundred forty-seven".