6440311 has 2 divisors, whose sum is σ = 6440312. Its totient is φ = 6440310.

The previous prime is 6440303. The next prime is 6440327. The reversal of 6440311 is 1130446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6440311 - 2³ = 6440303 is a prime.

6440311 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220155 + 3220156.

It is an arithmetic number, because the mean of its divisors is an integer number (3220156).

Almost surely, 2^6440311 is an apocalyptic number.

6440311 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440311 is an equidigital number, since it uses as much as digits as its factorization.

6440311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 6440311 is about 2537.7767829342. The cubic root of 6440311 is about 186.0525442178.

Adding to 6440311 its reverse (1130446), we get a palindrome (7570757).

The spelling of 6440311 in words is "six million, four hundred forty thousand, three hundred eleven".