6691099 has 2 divisors, whose sum is σ = 6691100. Its totient is φ = 6691098.

The previous prime is 6691093. The next prime is 6691129. The reversal of 6691099 is 9901966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6691099 - 2⁹ = 6690587 is a prime.

It is not a weakly prime, because it can be changed into another prime (6691093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345549 + 3345550.

It is an arithmetic number, because the mean of its divisors is an integer number (3345550).

Almost surely, 2^6691099 is an apocalyptic number.

6691099 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691099 is an equidigital number, since it uses as much as digits as its factorization.

6691099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 6691099 is about 2586.7158715251. The cubic root of 6691099 is about 188.4368425355.

The spelling of 6691099 in words is "six million, six hundred ninety-one thousand, ninety-nine".