6641399 has 2 divisors, whose sum is σ = 6641400. Its totient is φ = 6641398.

The previous prime is 6641387. The next prime is 6641419. The reversal of 6641399 is 9931466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6641399 - 2⁸ = 6641143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6641329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320699 + 3320700.

It is an arithmetic number, because the mean of its divisors is an integer number (3320700).

Almost surely, 2^6641399 is an apocalyptic number.

6641399 is a deficient number, since it is larger than the sum of its proper divisors (1).

6641399 is an equidigital number, since it uses as much as digits as its factorization.

6641399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 38.

The square root of 6641399 is about 2577.0911896943. The cubic root of 6641399 is about 187.9691268905.

The spelling of 6641399 in words is "six million, six hundred forty-one thousand, three hundred ninety-nine".