51320 has 16 divisors (see below), whose sum is σ = 115560. Its totient is φ = 20512.
The previous prime is 51307. The next prime is 51329. The reversal of 51320 is 2315.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (51329) by changing a digit.
51320 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
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, 602 + ... + 681.
251320 is an apocalyptic number.
It is an amenable number.
51320 is an abundant number, since it is smaller than the sum of its proper divisors (64240).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57780).
51320 is a wasteful number, since it uses less digits than its factorization.
51320 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1294 (or 1290 counting only the distinct ones).
The product of its (nonzero) digits is 30, while the sum is 11.
The square root of 51320 is about 226.5391798343. The cubic root of 51320 is about 37.1616979646.
Adding to 51320 its reverse (2315), we get a palindrome (53635).
The spelling of 51320 in words is "fifty-one thousand, three hundred twenty".
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