6691049 has 2 divisors, whose sum is σ = 6691050. Its totient is φ = 6691048.

The previous prime is 6691039. The next prime is 6691051. The reversal of 6691049 is 9401966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4380649 + 2310400 = 2093^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691049 - 2¹⁶ = 6625513 is a prime.

Together with 6691051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6691019) 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, 3345524 + 3345525.

It is an arithmetic number, because the mean of its divisors is an integer number (3345525).

Almost surely, 2^6691049 is an apocalyptic number.

It is an amenable number.

6691049 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691049 is an equidigital number, since it uses as much as digits as its factorization.

6691049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 6691049 is about 2586.7062067425. The cubic root of 6691049 is about 188.4363731624.

The spelling of 6691049 in words is "six million, six hundred ninety-one thousand, forty-nine".