6687121 has 8 divisors (see below), whose sum is σ = 7849280. Its totient is φ = 5576688.

The previous prime is 6687097. The next prime is 6687127. The reversal of 6687121 is 1217866.

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 6687121 - 2¹³ = 6678929 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 (6687127) 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, 12651 + ... + 13168.

It is an arithmetic number, because the mean of its divisors is an integer number (981160).

Almost surely, 2^6687121 is an apocalyptic number.

It is an amenable number.

6687121 is a deficient number, since it is larger than the sum of its proper divisors (1162159).

6687121 is a wasteful number, since it uses less digits than its factorization.

6687121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25863.

The product of its digits is 4032, while the sum is 31.

The square root of 6687121 is about 2585.9468285330. The cubic root of 6687121 is about 188.3994919020.

The spelling of 6687121 in words is "six million, six hundred eighty-seven thousand, one hundred twenty-one".