2016818281 has 3 divisors (see below), whose sum is σ = 2016863191. Its totient is φ = 2016773372.

The previous prime is 2016818267. The next prime is 2016818291. The reversal of 2016818281 is 1828186102.

It is a happy number.

The square root of 2016818281 is 44909.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 340734681 + 1676083600 = 18459^2 + 40940^2 .

It is not a de Polignac number, because 2016818281 - 2²³ = 2008429673 is a prime.

It is a super-2 number, since 2×2016818281² = 8135111957151589922, which contains 22 as substring.

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 2016818281.

It is not an unprimeable number, because it can be changed into a prime (2016818201) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22455 + ... + 67363.

Almost surely, 2^2016818281 is an apocalyptic number.

2016818281 is the 44909-th square number.

2016818281 is the 22455-th centered octagonal number.

It is an amenable number.

2016818281 is a deficient number, since it is larger than the sum of its proper divisors (44910).

2016818281 is an frugal number, since it uses more digits than its factorization.

2016818281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89818 (or 44909 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 37.

The cubic root of 2016818281 is about 1263.4428143035.

The spelling of 2016818281 in words is "two billion, sixteen million, eight hundred eighteen thousand, two hundred eighty-one".