6909 has 12 divisors (see below), whose sum is σ = 10944. Its totient is φ = 3864.

The previous prime is 6907. The next prime is 6911. The reversal of 6909 is 9096.

It is an interprime number because it is at equal distance from previous prime (6907) and next prime (6911).

It is not a de Polignac number, because 6909 - 2¹ = 6907 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

6909 is a lucky number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124 + ... + 170.

It is an arithmetic number, because the mean of its divisors is an integer number (912).

2⁶⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

6909 is a deficient number, since it is larger than the sum of its proper divisors (4035).

6909 is a wasteful number, since it uses less digits than its factorization.

6909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 6909 is about 83.1203946093. The cubic root of 6909 is about 19.0460563202.

Subtracting 6909 from its reverse (9096), we obtain a 7-th power (2187 = 3⁷).

The spelling of 6909 in words is "six thousand, nine hundred nine".