Search a number
-
+
51851 = 192729
BaseRepresentation
bin1100101010001011
32122010102
430222023
53124401
61040015
7304112
oct145213
978112
1051851
1135a58
122600b
131a7a7
1414c79
151056b
hexca8b

51851 has 4 divisors (see below), whose sum is σ = 54600. Its totient is φ = 49104.

The previous prime is 51839. The next prime is 51853. The reversal of 51851 is 15815.

51851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15815 = 53163.

It is a cyclic number.

It is not a de Polignac number, because 51851 - 26 = 51787 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1346 + ... + 1383.

It is an arithmetic number, because the mean of its divisors is an integer number (13650).

251851 is an apocalyptic number.

51851 is a deficient number, since it is larger than the sum of its proper divisors (2749).

51851 is a wasteful number, since it uses less digits than its factorization.

51851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748.

The product of its digits is 200, while the sum is 20.

The square root of 51851 is about 227.7081465385. The cubic root of 51851 is about 37.2894271965.

The spelling of 51851 in words is "fifty-one thousand, eight hundred fifty-one".

Divisors: 1 19 2729 51851