6391471 has 2 divisors, whose sum is σ = 6391472. Its totient is φ = 6391470.

The previous prime is 6391457. The next prime is 6391499. The reversal of 6391471 is 1741936.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6391471 is a prime.

It is a super-3 number, since 3×6391471³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6391421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195735 + 3195736.

It is an arithmetic number, because the mean of its divisors is an integer number (3195736).

Almost surely, 2^6391471 is an apocalyptic number.

6391471 is a deficient number, since it is larger than the sum of its proper divisors (1).

6391471 is an equidigital number, since it uses as much as digits as its factorization.

6391471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 6391471 is about 2528.1358745131. The cubic root of 6391471 is about 185.5810414487.

The spelling of 6391471 in words is "six million, three hundred ninety-one thousand, four hundred seventy-one".