6688291 has 4 divisors (see below), whose sum is σ = 6707592. Its totient is φ = 6668992.

The previous prime is 6688273. The next prime is 6688301. The reversal of 6688291 is 1928866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1928866 = 2 ⋅964433.

It is a cyclic number.

It is not a de Polignac number, because 6688291 - 2¹¹ = 6686243 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6688211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9121 + ... + 9826.

It is an arithmetic number, because the mean of its divisors is an integer number (1676898).

Almost surely, 2^6688291 is an apocalyptic number.

6688291 is a deficient number, since it is larger than the sum of its proper divisors (19301).

6688291 is a wasteful number, since it uses less digits than its factorization.

6688291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19300.

The product of its digits is 41472, while the sum is 40.

The square root of 6688291 is about 2586.1730413876. The cubic root of 6688291 is about 188.4104789197.

The spelling of 6688291 in words is "six million, six hundred eighty-eight thousand, two hundred ninety-one".