6686121 has 8 divisors (see below), whose sum is σ = 9600640. Its totient is φ = 4114512.

The previous prime is 6686107. The next prime is 6686167. The reversal of 6686121 is 1216866.

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

It is a de Polignac number, because none of the positive numbers 2^k-6686121 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6686191) 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, 85681 + ... + 85758.

It is an arithmetic number, because the mean of its divisors is an integer number (1200080).

Almost surely, 2^6686121 is an apocalyptic number.

It is an amenable number.

6686121 is a deficient number, since it is larger than the sum of its proper divisors (2914519).

6686121 is a wasteful number, since it uses less digits than its factorization.

6686121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171455.

The product of its digits is 3456, while the sum is 30.

The square root of 6686121 is about 2585.7534685271. The cubic root of 6686121 is about 188.3901002727.

The spelling of 6686121 in words is "six million, six hundred eighty-six thousand, one hundred twenty-one".