16805161 has 4 divisors (see below), whose sum is σ = 16816900. Its totient is φ = 16793424.

The previous prime is 16805119. The next prime is 16805167. The reversal of 16805161 is 16150861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16150861 = 233 ⋅69317.

It can be written as a sum of positive squares in 2 ways, for example, as 6533136 + 10272025 = 2556^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 16805161 - 2⁹ = 16804649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16805167) 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, 3366 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (4204225).

Almost surely, 2^16805161 is an apocalyptic number.

It is an amenable number.

16805161 is a deficient number, since it is larger than the sum of its proper divisors (11739).

16805161 is a wasteful number, since it uses less digits than its factorization.

16805161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11738.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 16805161 is about 4099.4098355739. The cubic root of 16805161 is about 256.1420567769.

The spelling of 16805161 in words is "sixteen million, eight hundred five thousand, one hundred sixty-one".