6909121 has 4 divisors (see below), whose sum is σ = 7095892. Its totient is φ = 6722352.

The previous prime is 6909113. The next prime is 6909127. The reversal of 6909121 is 1219096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5948721 + 960400 = 2439^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 6909121 - 2³ = 6909113 is a prime.

It is a Duffinian number.

6909121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6909121.

It is not an unprimeable number, because it can be changed into a prime (6909127) 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 in 3 ways as a sum of consecutive naturals, for example, 93330 + ... + 93403.

It is an arithmetic number, because the mean of its divisors is an integer number (1773973).

Almost surely, 2^6909121 is an apocalyptic number.

It is an amenable number.

6909121 is a deficient number, since it is larger than the sum of its proper divisors (186771).

6909121 is a wasteful number, since it uses less digits than its factorization.

6909121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186770.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 6909121 is about 2628.5206866220. The cubic root of 6909121 is about 190.4616750655.

The spelling of 6909121 in words is "six million, nine hundred nine thousand, one hundred twenty-one".