6644413 has 2 divisors, whose sum is σ = 6644414. Its totient is φ = 6644412.

The previous prime is 6644389. The next prime is 6644431. The reversal of 6644413 is 3144466.

It is a happy number.

Together with next prime (6644431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5943844 + 700569 = 2438^2 + 837^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644413 - 2⁵ = 6644381 is a prime.

It is a super-2 number, since 2×6644413² = 88296448229138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6644483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322206 + 3322207.

It is an arithmetic number, because the mean of its divisors is an integer number (3322207).

Almost surely, 2^6644413 is an apocalyptic number.

It is an amenable number.

6644413 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644413 is an equidigital number, since it uses as much as digits as its factorization.

6644413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 28.

The square root of 6644413 is about 2577.6758911857. The cubic root of 6644413 is about 187.9975573094.

Adding to 6644413 its reverse (3144466), we get a palindrome (9788879).

The spelling of 6644413 in words is "six million, six hundred forty-four thousand, four hundred thirteen".