6445247 has 2 divisors, whose sum is σ = 6445248. Its totient is φ = 6445246.

The previous prime is 6445223. The next prime is 6445259. The reversal of 6445247 is 7425446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6445247 - 2¹⁸ = 6183103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6445217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222623 + 3222624.

It is an arithmetic number, because the mean of its divisors is an integer number (3222624).

Almost surely, 2^6445247 is an apocalyptic number.

6445247 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445247 is an equidigital number, since it uses as much as digits as its factorization.

6445247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 32.

The square root of 6445247 is about 2538.7491014277. The cubic root of 6445247 is about 186.1000637057.

The spelling of 6445247 in words is "six million, four hundred forty-five thousand, two hundred forty-seven".