16784161 has 4 divisors (see below), whose sum is σ = 16796052. Its totient is φ = 16772272.

The previous prime is 16784107. The next prime is 16784167. The reversal of 16784161 is 16148761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1134225 + 15649936 = 1065^2 + 3956^2 .

It is a cyclic number.

It is not a de Polignac number, because 16784161 - 2¹⁷ = 16653089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16784167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3490 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (4199013).

Almost surely, 2^16784161 is an apocalyptic number.

It is an amenable number.

16784161 is a deficient number, since it is larger than the sum of its proper divisors (11891).

16784161 is a wasteful number, since it uses less digits than its factorization.

16784161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11890.

The product of its digits is 8064, while the sum is 34.

The square root of 16784161 is about 4096.8476906031. The cubic root of 16784161 is about 256.0353192236.

The spelling of 16784161 in words is "sixteen million, seven hundred eighty-four thousand, one hundred sixty-one".