51121360 has 40 divisors (see below), whose sum is σ = 120304800. Its totient is φ = 20199552.

The previous prime is 51121339. The next prime is 51121361. The reversal of 51121360 is 6312115.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×51121360² = 5226786896499200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2791 + ... + 10489.

It is an arithmetic number, because the mean of its divisors is an integer number (3007620).

Almost surely, 2^51121360 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 51121360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60152400).

51121360 is an abundant number, since it is smaller than the sum of its proper divisors (69183440).

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

51121360 is a wasteful number, since it uses less digits than its factorization.

51121360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7795 (or 7789 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 51121360 is about 7149.9202792758. The cubic root of 51121360 is about 371.1368975300.

Adding to 51121360 its reverse (6312115), we get a palindrome (57433475).

The spelling of 51121360 in words is "fifty-one million, one hundred twenty-one thousand, three hundred sixty".