51211480 has 64 divisors (see below), whose sum is σ = 123171840. Its totient is φ = 19095552.

The previous prime is 51211451. The next prime is 51211481. The reversal of 51211480 is 8411215.

51211480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51211481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86064 + ... + 86656.

It is an arithmetic number, because the mean of its divisors is an integer number (1924560).

Almost surely, 2^51211480 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 51211480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61585920).

51211480 is an abundant number, since it is smaller than the sum of its proper divisors (71960360).

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

51211480 is a wasteful number, since it uses less digits than its factorization.

51211480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 51211480 is about 7156.2196724248. The cubic root of 51211480 is about 371.3548574483.

Adding to 51211480 its reverse (8411215), we get a palindrome (59622695).

The spelling of 51211480 in words is "fifty-one million, two hundred eleven thousand, four hundred eighty".