16871661 has 6 divisors (see below), whose sum is σ = 24370190. Its totient is φ = 11247768.

The previous prime is 16871629. The next prime is 16871663. The reversal of 16871661 is 16617861.

It can be written as a sum of positive squares in only one way, i.e., 9418761 + 7452900 = 3069^2 + 2730^2 .

It is not a de Polignac number, because 16871661 - 2⁵ = 16871629 is a prime.

It is a super-3 number, since 3×16871661³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16871663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 937306 + ... + 937323.

Almost surely, 2^16871661 is an apocalyptic number.

It is an amenable number.

16871661 is a deficient number, since it is larger than the sum of its proper divisors (7498529).

16871661 is a wasteful number, since it uses less digits than its factorization.

16871661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874635 (or 1874632 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 16871661 is about 4107.5127510453. The cubic root of 16871661 is about 256.4794735236.

The spelling of 16871661 in words is "sixteen million, eight hundred seventy-one thousand, six hundred sixty-one".