6691009 has 8 divisors (see below), whose sum is σ = 7438592. Its totient is φ = 5976720.

The previous prime is 6691007. The next prime is 6691019. The reversal of 6691009 is 9001966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6691009 - 2¹ = 6691007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6691007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7899 + ... + 8704.

It is an arithmetic number, because the mean of its divisors is an integer number (929824).

Almost surely, 2^6691009 is an apocalyptic number.

It is an amenable number.

6691009 is a deficient number, since it is larger than the sum of its proper divisors (747583).

6691009 is a wasteful number, since it uses less digits than its factorization.

6691009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16647.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 6691009 is about 2586.6984748903. The cubic root of 6691009 is about 188.4359976623.

The spelling of 6691009 in words is "six million, six hundred ninety-one thousand, nine".