16304161 has 4 divisors (see below), whose sum is σ = 16744852. Its totient is φ = 15863472.

The previous prime is 16304153. The next prime is 16304213. The reversal of 16304161 is 16140361.

It is a happy number.

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 12559936 + 3744225 = 3544^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 16304161 - 2³ = 16304153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16304131) 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, 220290 + ... + 220363.

It is an arithmetic number, because the mean of its divisors is an integer number (4186213).

Almost surely, 2^16304161 is an apocalyptic number.

It is an amenable number.

16304161 is a deficient number, since it is larger than the sum of its proper divisors (440691).

16304161 is an equidigital number, since it uses as much as digits as its factorization.

16304161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440690.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 16304161 is about 4037.8411310996. The cubic root of 16304161 is about 253.5709426201.

The spelling of 16304161 in words is "sixteen million, three hundred four thousand, one hundred sixty-one".