16204109 has 4 divisors (see below), whose sum is σ = 16235616. Its totient is φ = 16172604.

The previous prime is 16204099. The next prime is 16204129. The reversal of 16204109 is 90140261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16204109 - 2¹² = 16200013 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 (16204129) 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 3 ways as a sum of consecutive naturals, for example, 14969 + ... + 16014.

It is an arithmetic number, because the mean of its divisors is an integer number (4058904).

Almost surely, 2^16204109 is an apocalyptic number.

It is an amenable number.

16204109 is a deficient number, since it is larger than the sum of its proper divisors (31507).

16204109 is an equidigital number, since it uses as much as digits as its factorization.

16204109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31506.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16204109 is about 4025.4327717650. The cubic root of 16204109 is about 253.0511907748.

The spelling of 16204109 in words is "sixteen million, two hundred four thousand, one hundred nine".