6440113 has 2 divisors, whose sum is σ = 6440114. Its totient is φ = 6440112.

The previous prime is 6440099. The next prime is 6440131. The reversal of 6440113 is 3110446.

It is a happy number.

Together with next prime (6440131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5531904 + 908209 = 2352^2 + 953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440113 is a prime.

6440113 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6440143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220056 + 3220057.

It is an arithmetic number, because the mean of its divisors is an integer number (3220057).

Almost surely, 2^6440113 is an apocalyptic number.

It is an amenable number.

6440113 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440113 is an equidigital number, since it uses as much as digits as its factorization.

6440113 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6440113 is about 2537.7377721112. The cubic root of 6440113 is about 186.0506375406.

Adding to 6440113 its reverse (3110446), we get a palindrome (9550559).

The spelling of 6440113 in words is "six million, four hundred forty thousand, one hundred thirteen".