16643041 has 4 divisors (see below), whose sum is σ = 16654084. Its totient is φ = 16632000.

The previous prime is 16643023. The next prime is 16643087. The reversal of 16643041 is 14034661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14034661 = 31 ⋅452731.

It can be written as a sum of positive squares in 2 ways, for example, as 10497600 + 6145441 = 3240^2 + 2479^2 .

It is a cyclic number.

It is not a de Polignac number, because 16643041 - 2⁹ = 16642529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16642997 and 16643015.

It is not an unprimeable number, because it can be changed into a prime (16647041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2820 + ... + 6421.

It is an arithmetic number, because the mean of its divisors is an integer number (4163521).

Almost surely, 2^16643041 is an apocalyptic number.

It is an amenable number.

16643041 is a deficient number, since it is larger than the sum of its proper divisors (11043).

16643041 is an equidigital number, since it uses as much as digits as its factorization.

16643041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11042.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 16643041 is about 4079.5883370752. The cubic root of 16643041 is about 255.3157232471.

The spelling of 16643041 in words is "sixteen million, six hundred forty-three thousand, forty-one".