6688131 has 16 divisors (see below), whose sum is σ = 9129120. Its totient is φ = 4354560.

The previous prime is 6688127. The next prime is 6688151. The reversal of 6688131 is 1318866.

It is not a de Polignac number, because 6688131 - 2² = 6688127 is a prime.

It is a super-2 number, since 2×6688131² = 89462192546322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6688092 and 6688101.

It is not an unprimeable number, because it can be changed into a prime (6688111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36861 + ... + 37041.

It is an arithmetic number, because the mean of its divisors is an integer number (570570).

Almost surely, 2^6688131 is an apocalyptic number.

6688131 is a deficient number, since it is larger than the sum of its proper divisors (2440989).

6688131 is a wasteful number, since it uses less digits than its factorization.

6688131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406.

The product of its digits is 6912, while the sum is 33.

The square root of 6688131 is about 2586.1421074643. The cubic root of 6688131 is about 188.4089764972.

The spelling of 6688131 in words is "six million, six hundred eighty-eight thousand, one hundred thirty-one".