51534520 has 16 divisors (see below), whose sum is σ = 115952760. Its totient is φ = 20613792.

The previous prime is 51534503. The next prime is 51534523. The reversal of 51534520 is 2543515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51534523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644142 + ... + 644221.

Almost surely, 2^51534520 is an apocalyptic number.

It is an amenable number.

51534520 is an abundant number, since it is smaller than the sum of its proper divisors (64418240).

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

51534520 is a wasteful number, since it uses less digits than its factorization.

51534520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288374 (or 1288370 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 51534520 is about 7178.7547666709. The cubic root of 51534520 is about 372.1340519693.

The spelling of 51534520 in words is "fifty-one million, five hundred thirty-four thousand, five hundred twenty".