16897109 has 4 divisors (see below), whose sum is σ = 17071404. Its totient is φ = 16722816.

The previous prime is 16897103. The next prime is 16897129. The reversal of 16897109 is 90179861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90179861 = 769 ⋅117269.

It can be written as a sum of positive squares in 2 ways, for example, as 8614225 + 8282884 = 2935^2 + 2878^2 .

It is a cyclic number.

It is not a de Polignac number, because 16897109 - 2⁴ = 16897093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16897103) 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, 87002 + ... + 87195.

It is an arithmetic number, because the mean of its divisors is an integer number (4267851).

Almost surely, 2^16897109 is an apocalyptic number.

It is an amenable number.

16897109 is a deficient number, since it is larger than the sum of its proper divisors (174295).

16897109 is an equidigital number, since it uses as much as digits as its factorization.

16897109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174294.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 16897109 is about 4110.6093222295. The cubic root of 16897109 is about 256.6083604744.

The spelling of 16897109 in words is "sixteen million, eight hundred ninety-seven thousand, one hundred nine".