6391247 has 2 divisors, whose sum is σ = 6391248. Its totient is φ = 6391246.

The previous prime is 6391243. The next prime is 6391261. The reversal of 6391247 is 7421936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6391247 - 2² = 6391243 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 (6391241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195623 + 3195624.

It is an arithmetic number, because the mean of its divisors is an integer number (3195624).

Almost surely, 2^6391247 is an apocalyptic number.

6391247 is a deficient number, since it is larger than the sum of its proper divisors (1).

6391247 is an equidigital number, since it uses as much as digits as its factorization.

6391247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 6391247 is about 2528.0915727086. The cubic root of 6391247 is about 185.5788734221.

The spelling of 6391247 in words is "six million, three hundred ninety-one thousand, two hundred forty-seven".