16744561 has 8 divisors (see below), whose sum is σ = 17092904. Its totient is φ = 16398720.

The previous prime is 16744517. The next prime is 16744577. The reversal of 16744561 is 16544761.

It can be written as a sum of positive squares in 4 ways, for example, as 90000 + 16654561 = 300^2 + 4081^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16744561 - 2¹⁹ = 16220273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16744591) 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 7 ways as a sum of consecutive naturals, for example, 18655 + ... + 19531.

It is an arithmetic number, because the mean of its divisors is an integer number (2136613).

Almost surely, 2^16744561 is an apocalyptic number.

It is an amenable number.

16744561 is a deficient number, since it is larger than the sum of its proper divisors (348343).

16744561 is an equidigital number, since it uses as much as digits as its factorization.

16744561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251.

The product of its digits is 20160, while the sum is 34.

The square root of 16744561 is about 4092.0118523778. The cubic root of 16744561 is about 255.8338002045.

The spelling of 16744561 in words is "sixteen million, seven hundred forty-four thousand, five hundred sixty-one".