51430530 has 64 divisors (see below), whose sum is σ = 135613440. Its totient is φ = 12424896.

The previous prime is 51430529. The next prime is 51430567. The reversal of 51430530 is 3503415.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51430497 and 51430506.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11149 + ... + 15071.

It is an arithmetic number, because the mean of its divisors is an integer number (2118960).

Almost surely, 2^51430530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51430530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67806720).

51430530 is an abundant number, since it is smaller than the sum of its proper divisors (84182910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51430530 is a wasteful number, since it uses less digits than its factorization.

51430530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 51430530 is about 7171.5082095749. The cubic root of 51430530 is about 371.8835772802.

Adding to 51430530 its reverse (3503415), we get a palindrome (54933945).

The spelling of 51430530 in words is "fifty-one million, four hundred thirty thousand, five hundred thirty".