2881881 has 6 divisors (see below), whose sum is σ = 4162730. Its totient is φ = 1921248.

The previous prime is 2881873. The next prime is 2881883. The reversal of 2881881 is 1881882.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2752281 + 129600 = 1659^2 + 360^2 .

It is not a de Polignac number, because 2881881 - 2³ = 2881873 is a prime.

It is a super-2 number, since 2×2881881² = 16610476196322, which contains 22 as substring.

It is a Duffinian number.

2881881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2881883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 160096 + ... + 160113.

2^2881881 is an apocalyptic number.

It is an amenable number.

2881881 is a deficient number, since it is larger than the sum of its proper divisors (1280849).

2881881 is a wasteful number, since it uses less digits than its factorization.

2881881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320215 (or 320212 counting only the distinct ones).

The product of its digits is 8192, while the sum is 36.

The square root of 2881881 is about 1697.6103793274. The cubic root of 2881881 is about 142.3067000511.

Subtracting from 2881881 its reverse (1881882), we obtain a palindrome (999999).

The spelling of 2881881 in words is "two million, eight hundred eighty-one thousand, eight hundred eighty-one".