16442081 has 4 divisors (see below), whose sum is σ = 16453632. Its totient is φ = 16430532.

The previous prime is 16442071. The next prime is 16442099. The reversal of 16442081 is 18024461.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16442081 is a prime.

It is a super-3 number, since 3×16442081³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16442081.

It is not an unprimeable number, because it can be changed into a prime (16442071) 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, 3281 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (4113408).

Almost surely, 2^16442081 is an apocalyptic number.

It is an amenable number.

16442081 is a deficient number, since it is larger than the sum of its proper divisors (11551).

16442081 is an equidigital number, since it uses as much as digits as its factorization.

16442081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11550.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 16442081 is about 4054.8835988225. The cubic root of 16442081 is about 254.2839375466.

The spelling of 16442081 in words is "sixteen million, four hundred forty-two thousand, eighty-one".