16897717 has 4 divisors (see below), whose sum is σ = 17021196. Its totient is φ = 16774240.

The previous prime is 16897703. The next prime is 16897747. The reversal of 16897717 is 71779861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71779861 = 53 ⋅1354337.

It can be written as a sum of positive squares in 2 ways, for example, as 13942756 + 2954961 = 3734^2 + 1719^2 .

It is a cyclic number.

It is not a de Polignac number, because 16897717 - 2⁷ = 16897589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16897747) 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, 61534 + ... + 61807.

It is an arithmetic number, because the mean of its divisors is an integer number (4255299).

Almost surely, 2^16897717 is an apocalyptic number.

It is an amenable number.

16897717 is a deficient number, since it is larger than the sum of its proper divisors (123479).

16897717 is a wasteful number, since it uses less digits than its factorization.

16897717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123478.

The product of its digits is 148176, while the sum is 46.

The square root of 16897717 is about 4110.6832765369. The cubic root of 16897717 is about 256.6114382398.

The spelling of 16897717 in words is "sixteen million, eight hundred ninety-seven thousand, seven hundred seventeen".