16081 has 4 divisors (see below), whose sum is σ = 17332. Its totient is φ = 14832.

The previous prime is 16073. The next prime is 16087. The reversal of 16081 is 18061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7056 + 9025 = 84^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 16081 - 2³ = 16073 is a prime.

It is a super-2 number, since 2×16081² = 517197122, which contains 22 as substring.

It is a Duffinian number.

16081 is a lucky number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (16087) 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, 606 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (4333).

2¹⁶⁰⁸¹ is an apocalyptic number.

It is an amenable number.

16081 is a deficient number, since it is larger than the sum of its proper divisors (1251).

16081 is a wasteful number, since it uses less digits than its factorization.

16081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 16081 is about 126.8108828137. The cubic root of 16081 is about 25.2408717780.

Adding to 16081 its product of nonzero digits (48), we get a square (16129 = 127²).

The spelling of 16081 in words is "sixteen thousand, eighty-one".