6648409 has 2 divisors, whose sum is σ = 6648410. Its totient is φ = 6648408.

The previous prime is 6648407. The next prime is 6648413. The reversal of 6648409 is 9048466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4214809 + 2433600 = 2053^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 6648409 - 2¹ = 6648407 is a prime.

Together with 6648407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6648401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324204 + 3324205.

It is an arithmetic number, because the mean of its divisors is an integer number (3324205).

Almost surely, 2^6648409 is an apocalyptic number.

It is an amenable number.

6648409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6648409 is an equidigital number, since it uses as much as digits as its factorization.

6648409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 6648409 is about 2578.4508915238. The cubic root of 6648409 is about 188.0352374722.

The spelling of 6648409 in words is "six million, six hundred forty-eight thousand, four hundred nine".