6909661 has 8 divisors (see below), whose sum is σ = 7560000. Its totient is φ = 6263040.

The previous prime is 6909659. The next prime is 6909677. The reversal of 6909661 is 1669096.

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 6909661 - 2¹ = 6909659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6909661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6909641) 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, 4240 + ... + 5638.

It is an arithmetic number, because the mean of its divisors is an integer number (945000).

Almost surely, 2^6909661 is an apocalyptic number.

It is an amenable number.

6909661 is a deficient number, since it is larger than the sum of its proper divisors (650339).

6909661 is a wasteful number, since it uses less digits than its factorization.

6909661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 6909661 is about 2628.6234039892. The cubic root of 6909661 is about 190.4666369425.

The spelling of 6909661 in words is "six million, nine hundred nine thousand, six hundred sixty-one".