16643441 has 4 divisors (see below), whose sum is σ = 16745712. Its totient is φ = 16541172.

The previous prime is 16643401. The next prime is 16643447. The reversal of 16643441 is 14434661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14434661 = 19 ⋅759719.

It is a cyclic number.

It is not a de Polignac number, because 16643441 - 2¹⁴ = 16627057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16643447) 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, 50891 + ... + 51216.

It is an arithmetic number, because the mean of its divisors is an integer number (4186428).

Almost surely, 2^16643441 is an apocalyptic number.

It is an amenable number.

16643441 is a deficient number, since it is larger than the sum of its proper divisors (102271).

16643441 is a wasteful number, since it uses less digits than its factorization.

16643441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102270.

The product of its digits is 6912, while the sum is 29.

The square root of 16643441 is about 4079.6373613350. The cubic root of 16643441 is about 255.3177686560.

The spelling of 16643441 in words is "sixteen million, six hundred forty-three thousand, four hundred forty-one".