16671817 has 6 divisors (see below), whose sum is σ = 16796234. Its totient is φ = 16548240.

The previous prime is 16671791. The next prime is 16671821. The reversal of 16671817 is 71817661.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 583696 = 4011^2 + 764^2 .

It is not a de Polignac number, because 16671817 - 2¹⁹ = 16147529 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 (16671827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36253 + ... + 36709.

Almost surely, 2^16671817 is an apocalyptic number.

It is an amenable number.

16671817 is a deficient number, since it is larger than the sum of its proper divisors (124417).

16671817 is an frugal number, since it uses more digits than its factorization.

16671817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 648 counting only the distinct ones).

The product of its digits is 14112, while the sum is 37.

The square root of 16671817 is about 4083.1136403485. The cubic root of 16671817 is about 255.4627864148.

The spelling of 16671817 in words is "sixteen million, six hundred seventy-one thousand, eight hundred seventeen".