51451120 has 80 divisors (see below), whose sum is σ = 138562560. Its totient is φ = 17402112.

The previous prime is 51451111. The next prime is 51451123. The reversal of 51451120 is 2115415.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51451123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43659 + ... + 44821.

It is an arithmetic number, because the mean of its divisors is an integer number (1732032).

Almost surely, 2^51451120 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 51451120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69281280).

51451120 is an abundant number, since it is smaller than the sum of its proper divisors (87111440).

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

51451120 is a wasteful number, since it uses less digits than its factorization.

51451120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 51451120 is about 7172.9436077527. The cubic root of 51451120 is about 371.9331980097.

Adding to 51451120 its reverse (2115415), we get a palindrome (53566535).

The spelling of 51451120 in words is "fifty-one million, four hundred fifty-one thousand, one hundred twenty".