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2681 = 7383
BaseRepresentation
bin101001111001
310200022
4221321
541211
620225
710550
oct5171
93608
102681
112018
121675
1312b3
14d97
15bdb
hexa79

2681 has 4 divisors (see below), whose sum is σ = 3072. Its totient is φ = 2292.

The previous prime is 2677. The next prime is 2683. The reversal of 2681 is 1862.

2681 is nontrivially palindromic in base 15.

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.

It is a cyclic number.

It is not a de Polignac number, because 2681 - 22 = 2677 is a prime.

It is a super-2 number, since 2×26812 = 14375522, which contains 22 as substring.

It is a magnanimous number.

It is a Duffinian number.

2681 is an undulating number in base 15.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (2683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185 + ... + 198.

It is an arithmetic number, because the mean of its divisors is an integer number (768).

22681 is an apocalyptic number.

It is an amenable number.

2681 is a deficient number, since it is larger than the sum of its proper divisors (391).

2681 is an equidigital number, since it uses as much as digits as its factorization.

2681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390.

The product of its digits is 96, while the sum is 17.

The square root of 2681 is about 51.7783738640. The cubic root of 2681 is about 13.8920265504.

The spelling of 2681 in words is "two thousand, six hundred eighty-one".

Divisors: 1 7 383 2681