6691801 has 2 divisors, whose sum is σ = 6691802. Its totient is φ = 6691800.

The previous prime is 6691799. The next prime is 6691843. The reversal of 6691801 is 1081966.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4618201 + 2073600 = 2149^2 + 1440^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691801 - 2¹ = 6691799 is a prime.

Together with 6691799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6691891) 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, 3345900 + 3345901.

It is an arithmetic number, because the mean of its divisors is an integer number (3345901).

Almost surely, 2^6691801 is an apocalyptic number.

It is an amenable number.

6691801 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691801 is an equidigital number, since it uses as much as digits as its factorization.

6691801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 6691801 is about 2586.8515612613. The cubic root of 6691801 is about 188.4434322870.

The spelling of 6691801 in words is "six million, six hundred ninety-one thousand, eight hundred one".