51530120 has 64 divisors (see below), whose sum is σ = 122688000. Its totient is φ = 19438848.

The previous prime is 51530113. The next prime is 51530131. The reversal of 51530120 is 2103515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72326 + ... + 73034.

It is an arithmetic number, because the mean of its divisors is an integer number (1917000).

Almost surely, 2^51530120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51530120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61344000).

51530120 is an abundant number, since it is smaller than the sum of its proper divisors (71157880).

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

51530120 is a wasteful number, since it uses less digits than its factorization.

51530120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 51530120 is about 7178.4483002944. The cubic root of 51530120 is about 372.1234607744.

Adding to 51530120 its reverse (2103515), we get a palindrome (53633635).

The spelling of 51530120 in words is "fifty-one million, five hundred thirty thousand, one hundred twenty".