6447671 has 2 divisors, whose sum is σ = 6447672. Its totient is φ = 6447670.

The previous prime is 6447653. The next prime is 6447673. The reversal of 6447671 is 1767446.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6447671 - 2¹⁸ = 6185527 is a prime.

It is a super-2 number, since 2×6447671² = 83144922648482, which contains 22 as substring.

Together with 6447673, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6447673) 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, 3223835 + 3223836.

It is an arithmetic number, because the mean of its divisors is an integer number (3223836).

Almost surely, 2^6447671 is an apocalyptic number.

6447671 is a deficient number, since it is larger than the sum of its proper divisors (1).

6447671 is an equidigital number, since it uses as much as digits as its factorization.

6447671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 6447671 is about 2539.2264570140. The cubic root of 6447671 is about 186.1233909738.

The spelling of 6447671 in words is "six million, four hundred forty-seven thousand, six hundred seventy-one".