16443961 has 4 divisors (see below), whose sum is σ = 16471924. Its totient is φ = 16416000.

The previous prime is 16443901. The next prime is 16443971. The reversal of 16443961 is 16934461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16934461 = 2203 ⋅7687.

It can be written as a sum of positive squares in 2 ways, for example, as 12033961 + 4410000 = 3469^2 + 2100^2 .

It is a cyclic number.

It is not a de Polignac number, because 16443961 - 2¹¹ = 16441913 is a prime.

It is a super-3 number, since 3×16443961³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16443901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13080 + ... + 14281.

It is an arithmetic number, because the mean of its divisors is an integer number (4117981).

Almost surely, 2^16443961 is an apocalyptic number.

It is an amenable number.

16443961 is a deficient number, since it is larger than the sum of its proper divisors (27963).

16443961 is an equidigital number, since it uses as much as digits as its factorization.

16443961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27962.

The product of its digits is 15552, while the sum is 34.

The square root of 16443961 is about 4055.1154114279. The cubic root of 16443961 is about 254.2936288499.

The spelling of 16443961 in words is "sixteen million, four hundred forty-three thousand, nine hundred sixty-one".