51504520 has 16 divisors (see below), whose sum is σ = 115885260. Its totient is φ = 20601792.

The previous prime is 51504511. The next prime is 51504529. The reversal of 51504520 is 2540515.

It is an interprime number because it is at equal distance from previous prime (51504511) and next prime (51504529).

It can be written as a sum of positive squares in 2 ways, for example, as 46812964 + 4691556 = 6842^2 + 2166^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51504491 and 51504500.

It is not an unprimeable number, because it can be changed into a prime (51504529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643767 + ... + 643846.

Almost surely, 2^51504520 is an apocalyptic number.

It is an amenable number.

51504520 is an abundant number, since it is smaller than the sum of its proper divisors (64380740).

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

51504520 is a wasteful number, since it uses less digits than its factorization.

51504520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287624 (or 1287620 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51504520 is about 7176.6649636165. The cubic root of 51504520 is about 372.0618273156.

The spelling of 51504520 in words is "fifty-one million, five hundred four thousand, five hundred twenty".