51530 has 8 divisors (see below), whose sum is σ = 92772. Its totient is φ = 20608.

The previous prime is 51521. The next prime is 51539. The reversal of 51530 is 3515.

It is a Cunningham number, because it is equal to 227²+1.

It is an interprime number because it is at equal distance from previous prime (51521) and next prime (51539).

It can be written as a sum of positive squares in 2 ways, for example, as 51529 + 1 = 227^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51530.

It is not an unprimeable number, because it can be changed into a prime (51539) by changing a digit.

51530 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, 2567 + ... + 2586.

2⁵¹⁵³⁰ is an apocalyptic number.

51530 is a deficient number, since it is larger than the sum of its proper divisors (41242).

51530 is a wasteful number, since it uses less digits than its factorization.

51530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5160.

The product of its (nonzero) digits is 75, while the sum is 14.

The square root of 51530 is about 227.0022026325. The cubic root of 51530 is about 37.2123171915.

It can be divided in two parts, 515 and 30, that added together give a palindrome (545).

The spelling of 51530 in words is "fifty-one thousand, five hundred thirty".