51361530 has 128 divisors (see below), whose sum is σ = 143824896. Its totient is φ = 11616000.

The previous prime is 51361511. The next prime is 51361537. The reversal of 51361530 is 3516315.

It is a self number, because there is not a number n which added to its sum of digits gives 51361530.

It is not an unprimeable number, because it can be changed into a prime (51361537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 508480 + ... + 508580.

It is an arithmetic number, because the mean of its divisors is an integer number (1123632).

Almost surely, 2^51361530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51361530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71912448).

51361530 is an abundant number, since it is smaller than the sum of its proper divisors (92463366).

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

51361530 is a wasteful number, since it uses less digits than its factorization.

51361530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 51361530 is about 7166.6958914133. The cubic root of 51361530 is about 371.7171945845.

Adding to 51361530 its reverse (3516315), we get a palindrome (54877845).

It can be divided in two parts, 5136 and 1530, that added together give a palindrome (6666).

The spelling of 51361530 in words is "fifty-one million, three hundred sixty-one thousand, five hundred thirty".