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2641 = 19139
BaseRepresentation
bin101001010001
310121211
4221101
541031
620121
710462
oct5121
93554
102641
111a91
121641
131282
14d69
15bb1
hexa51

2641 has 4 divisors (see below), whose sum is σ = 2800. Its totient is φ = 2484.

The previous prime is 2633. The next prime is 2647. The reversal of 2641 is 1462.

Subtracting from 2641 its sum of digits (13), we obtain a triangular number (2628 = T72).

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 2641 - 23 = 2633 is a prime.

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 (2647) 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, 51 + ... + 88.

It is an arithmetic number, because the mean of its divisors is an integer number (700).

22641 is an apocalyptic number.

2641 is the 33-rd centered pentagonal number.

It is an amenable number.

2641 is a deficient number, since it is larger than the sum of its proper divisors (159).

2641 is a wasteful number, since it uses less digits than its factorization.

2641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158.

The product of its digits is 48, while the sum is 13.

The square root of 2641 is about 51.3906606301. The cubic root of 2641 is about 13.8225912961.

The spelling of 2641 in words is "two thousand, six hundred forty-one".

Divisors: 1 19 139 2641