16871609 has 4 divisors (see below), whose sum is σ = 17264016. Its totient is φ = 16479204.

The previous prime is 16871597. The next prime is 16871629. The reversal of 16871609 is 90617861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90617861 = 23 ⋅3939907.

It is a cyclic number.

It is not a de Polignac number, because 16871609 - 2⁸ = 16871353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16871629) 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, 196139 + ... + 196224.

It is an arithmetic number, because the mean of its divisors is an integer number (4316004).

Almost surely, 2^16871609 is an apocalyptic number.

It is an amenable number.

16871609 is a deficient number, since it is larger than the sum of its proper divisors (392407).

16871609 is an equidigital number, since it uses as much as digits as its factorization.

16871609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392406.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 16871609 is about 4107.5064211757. The cubic root of 16871609 is about 256.4792100256.

The spelling of 16871609 in words is "sixteen million, eight hundred seventy-one thousand, six hundred nine".