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2881 = 4367
BaseRepresentation
bin101101000001
310221201
4231001
543011
621201
711254
oct5501
93851
102881
11218a
121801
131408
14109b
15cc1
hexb41

2881 has 4 divisors (see below), whose sum is σ = 2992. Its totient is φ = 2772.

The previous prime is 2879. The next prime is 2887. The reversal of 2881 is 1882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1882 = 2941.

It is a cyclic number.

It is not a de Polignac number, because 2881 - 21 = 2879 is a prime.

It is a super-2 number, since 2×28812 = 16600322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15 and base 16.

It is not an unprimeable number, because it can be changed into a prime (2887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10 + ... + 76.

It is an arithmetic number, because the mean of its divisors is an integer number (748).

It is a Proth number, since it is equal to 45 ⋅ 26 + 1 and 45 < 26.

22881 is an apocalyptic number.

It is an amenable number.

2881 is a deficient number, since it is larger than the sum of its proper divisors (111).

2881 is an equidigital number, since it uses as much as digits as its factorization.

2881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110.

The product of its digits is 128, while the sum is 19.

The square root of 2881 is about 53.6749476013. The cubic root of 2881 is about 14.2292197373.

Subtracting from 2881 its reverse (1882), we obtain a palindrome (999).

It can be divided in two parts, 288 and 1, that added together give a square (289 = 172).

The spelling of 2881 in words is "two thousand, eight hundred eighty-one".

Divisors: 1 43 67 2881