16443649 has 2 divisors, whose sum is σ = 16443650. Its totient is φ = 16443648.

The previous prime is 16443629. The next prime is 16443659. The reversal of 16443649 is 94634461.

16443649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 2433600 = 3743^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 16443649 - 2⁵ = 16443617 is a prime.

It is a super-3 number, since 3×16443649³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16443619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221824 + 8221825.

It is an arithmetic number, because the mean of its divisors is an integer number (8221825).

Almost surely, 2^16443649 is an apocalyptic number.

It is an amenable number.

16443649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16443649 is an equidigital number, since it uses as much as digits as its factorization.

16443649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 16443649 is about 4055.0769413169. The cubic root of 16443649 is about 254.2920205571.

The spelling of 16443649 in words is "sixteen million, four hundred forty-three thousand, six hundred forty-nine".