6440771 has 2 divisors, whose sum is σ = 6440772. Its totient is φ = 6440770.

The previous prime is 6440747. The next prime is 6440779. The reversal of 6440771 is 1770446.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6440771 - 2²² = 2246467 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6440779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220385 + 3220386.

It is an arithmetic number, because the mean of its divisors is an integer number (3220386).

Almost surely, 2^6440771 is an apocalyptic number.

6440771 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440771 is an equidigital number, since it uses as much as digits as its factorization.

6440771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 6440771 is about 2537.8674118243. The cubic root of 6440771 is about 186.0569737209.

The spelling of 6440771 in words is "six million, four hundred forty thousand, seven hundred seventy-one".