2861881681 has 8 divisors (see below), whose sum is σ = 2885355200. Its totient is φ = 2838492720.

The previous prime is 2861881667. The next prime is 2861881691. The reversal of 2861881681 is 1861881682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2861881681 - 2²⁹ = 2325010769 is a prime.

It is a super-2 number, since 2×2861881681² = 16380733512086771522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2861881621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47740 + ... + 89458.

It is an arithmetic number, because the mean of its divisors is an integer number (360669400).

Almost surely, 2^2861881681 is an apocalyptic number.

It is an amenable number.

2861881681 is a deficient number, since it is larger than the sum of its proper divisors (23473519).

2861881681 is a wasteful number, since it uses less digits than its factorization.

2861881681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42279.

The product of its digits is 294912, while the sum is 49.

The square root of 2861881681 is about 53496.5576556100. The cubic root of 2861881681 is about 1419.7674817657.

Subtracting from 2861881681 its reverse (1861881682), we obtain a palindrome (999999999).

The spelling of 2861881681 in words is "two billion, eight hundred sixty-one million, eight hundred eighty-one thousand, six hundred eighty-one".