16644541 has 4 divisors (see below), whose sum is σ = 16766172. Its totient is φ = 16522912.

The previous prime is 16644539. The next prime is 16644553. The reversal of 16644541 is 14544661.

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 12425625 + 4218916 = 3525^2 + 2054^2 .

It is a cyclic number.

It is not a de Polignac number, because 16644541 - 2¹ = 16644539 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16614541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60610 + ... + 60883.

It is an arithmetic number, because the mean of its divisors is an integer number (4191543).

Almost surely, 2^16644541 is an apocalyptic number.

It is an amenable number.

16644541 is a deficient number, since it is larger than the sum of its proper divisors (121631).

16644541 is a wasteful number, since it uses less digits than its factorization.

16644541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121630.

The product of its digits is 11520, while the sum is 31.

The square root of 16644541 is about 4079.7721750117. The cubic root of 16644541 is about 255.3233933614.

The spelling of 16644541 in words is "sixteen million, six hundred forty-four thousand, five hundred forty-one".