2781613081 has 9 divisors (see below), whose sum is σ = 3012785181. Its totient is φ = 2567009952.

The previous prime is 2781613073. The next prime is 2781613139. The reversal of 2781613081 is 1803161872.

The square root of 2781613081 is 52741.

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

It can be written as a sum of positive squares in 4 ways, for example, as 378652681 + 2402960400 = 19459^2 + 49020^2 .

It is not a de Polignac number, because 2781613081 - 2³ = 2781613073 is a prime.

It is a super-2 number, since 2×2781613081² = 15474742664780625122, 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 2781613081.

It is not an unprimeable number, because it can be changed into a prime (2781613781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 683605 + ... + 687661.

It is an arithmetic number, because the mean of its divisors is an integer number (334753909).

Almost surely, 2^2781613081 is an apocalyptic number.

2781613081 is the 52741-st square number.

2781613081 is the 26371-st centered octagonal number.

It is an amenable number.

2781613081 is a deficient number, since it is larger than the sum of its proper divisors (231172100).

2781613081 is an frugal number, since it uses more digits than its factorization.

2781613081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8140 (or 4070 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The cubic root of 2781613081 is about 1406.3677753119.

The spelling of 2781613081 in words is "two billion, seven hundred eighty-one million, six hundred thirteen thousand, eighty-one".