51051520 has 132 divisors (see below), whose sum is σ = 134856360. Its totient is φ = 18530304.

The previous prime is 51051509. The next prime is 51051523. The reversal of 51051520 is 2515015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51051523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 865251 + ... + 865309.

Almost surely, 2^51051520 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 51051520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67428180).

51051520 is an abundant number, since it is smaller than the sum of its proper divisors (83804840).

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

51051520 is a wasteful number, since it uses less digits than its factorization.

51051520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 51051520 is about 7145.0346395241. The cubic root of 51051520 is about 370.9678096079.

Adding to 51051520 its reverse (2515015), we get a palindrome (53566535).

The spelling of 51051520 in words is "fifty-one million, fifty-one thousand, five hundred twenty".