16688291 has 4 divisors (see below), whose sum is σ = 16698552. Its totient is φ = 16678032.

The previous prime is 16688281. The next prime is 16688299. The reversal of 16688291 is 19288661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16688291 - 2¹⁸ = 16426147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16688299) 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, 2090 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (4174638).

Almost surely, 2^16688291 is an apocalyptic number.

16688291 is a deficient number, since it is larger than the sum of its proper divisors (10261).

16688291 is an equidigital number, since it uses as much as digits as its factorization.

16688291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10260.

The product of its digits is 41472, while the sum is 41.

The square root of 16688291 is about 4085.1304752725. The cubic root of 16688291 is about 255.5469025916.

The spelling of 16688291 in words is "sixteen million, six hundred eighty-eight thousand, two hundred ninety-one".