2861287081 has 9 divisors (see below), whose sum is σ = 2888665591. Its totient is φ = 2834167144.

The previous prime is 2861287067. The next prime is 2861287087. The reversal of 2861287081 is 1807821682.

The square root of 2861287081 is 53491.

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

2861287081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 335219481 + 2526067600 = 18309^2 + 50260^2 .

It is not a de Polignac number, because 2861287081 - 2⁹ = 2861286569 is a prime.

It is a super-2 number, since 2×2861287081² = 16373927519795001122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2861287087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7969980 + ... + 7970338.

Almost surely, 2^2861287081 is an apocalyptic number.

2861287081 is the 53491-st square number.

2861287081 is the 26746-th centered octagonal number.

It is an amenable number.

2861287081 is a deficient number, since it is larger than the sum of its proper divisors (27378510).

2861287081 is an frugal number, since it uses more digits than its factorization.

2861287081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 43.

The cubic root of 2861287081 is about 1419.6691487677.

The spelling of 2861287081 in words is "two billion, eight hundred sixty-one million, two hundred eighty-seven thousand, eighty-one".