16544009 has 4 divisors (see below), whose sum is σ = 17517204. Its totient is φ = 15570816.

The previous prime is 16543999. The next prime is 16544023. The reversal of 16544009 is 90044561.

16544009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90044561 = 59 ⋅1526179.

It can be written as a sum of positive squares in 2 ways, for example, as 14592400 + 1951609 = 3820^2 + 1397^2 .

It is a cyclic number.

It is not a de Polignac number, because 16544009 - 2⁸ = 16543753 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (16544039) 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, 486572 + ... + 486605.

It is an arithmetic number, because the mean of its divisors is an integer number (4379301).

Almost surely, 2^16544009 is an apocalyptic number.

It is an amenable number.

16544009 is a deficient number, since it is larger than the sum of its proper divisors (973195).

16544009 is an equidigital number, since it uses as much as digits as its factorization.

16544009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973194.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 16544009 is about 4067.4327283927. The cubic root of 16544009 is about 254.8083090955.

The spelling of 16544009 in words is "sixteen million, five hundred forty-four thousand, nine".