2881007861 has 4 divisors (see below), whose sum is σ = 2888052300. Its totient is φ = 2873963424.

The previous prime is 2881007851. The next prime is 2881007873. The reversal of 2881007861 is 1687001882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1687001882 = 2 ⋅843500941.

It can be written as a sum of positive squares in 2 ways, for example, as 1798268836 + 1082739025 = 42406^2 + 32905^2 .

It is a cyclic number.

It is not a de Polignac number, because 2881007861 - 2⁶ = 2881007797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2881007851) 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, 3521606 + ... + 3522423.

It is an arithmetic number, because the mean of its divisors is an integer number (722013075).

Almost surely, 2^2881007861 is an apocalyptic number.

It is an amenable number.

2881007861 is a deficient number, since it is larger than the sum of its proper divisors (7044439).

2881007861 is an equidigital number, since it uses as much as digits as its factorization.

2881007861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7044438.

The product of its (nonzero) digits is 43008, while the sum is 41.

The square root of 2881007861 is about 53675.0208290598. The cubic root of 2881007861 is about 1422.9232679048.

The spelling of 2881007861 in words is "two billion, eight hundred eighty-one million, seven thousand, eight hundred sixty-one".