Search a number
BaseRepresentation
bin100001100101
32221121
4201211
532044
613541
76160
oct4145
92847
102149
111684
1212b1
13c94
15984
hex865

2149 has 4 divisors (see below), whose sum is σ = 2464. Its totient is φ = 1836.

The previous prime is 2143. The next prime is 2153. The reversal of 2149 is 9412.

It can be divided in two parts, 2 and 149, that added together give a palindrome (151).

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 2149 - 23 = 2141 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 13, base 15 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2141) 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, 147 + ... + 160.

It is an arithmetic number, because the mean of its divisors is an integer number (616).

It is an amenable number.

2149 is a deficient number, since it is larger than the sum of its proper divisors (315).

2149 is an equidigital number, since it uses as much as digits as its factorization.

2149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314.

The product of its digits is 72, while the sum is 16.

The square root of 2149 is about 46.3573079460. The cubic root of 2149 is about 12.9046274687.

The spelling of 2149 in words is "two thousand, one hundred forty-nine".

Divisors: 1 7 307 2149