6691039 has 2 divisors, whose sum is σ = 6691040. Its totient is φ = 6691038.

The previous prime is 6691037. The next prime is 6691049. The reversal of 6691039 is 9301966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6691039 - 2¹ = 6691037 is a prime.

Together with 6691037, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6690995 and 6691013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691037) 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, 3345519 + 3345520.

It is an arithmetic number, because the mean of its divisors is an integer number (3345520).

Almost surely, 2^6691039 is an apocalyptic number.

6691039 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691039 is an equidigital number, since it uses as much as digits as its factorization.

6691039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 6691039 is about 2586.7042737816. The cubic root of 6691039 is about 188.4362792875.

The spelling of 6691039 in words is "six million, six hundred ninety-one thousand, thirty-nine".