51505500 has 48 divisors (see below), whose sum is σ = 149988384. Its totient is φ = 13734400.

The previous prime is 51505481. The next prime is 51505501. The reversal of 51505500 is 550515.

51505500 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 (51505501) 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, 15669 + ... + 18668.

It is an arithmetic number, because the mean of its divisors is an integer number (3124758).

Almost surely, 2^51505500 is an apocalyptic number.

51505500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51505500 is an abundant number, since it is smaller than the sum of its proper divisors (98482884).

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

51505500 is a wasteful number, since it uses less digits than its factorization.

51505500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34359 (or 34347 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 51505500 is about 7176.7332401309. The cubic root of 51505500 is about 372.0641870973.

The spelling of 51505500 in words is "fifty-one million, five hundred five thousand, five hundred".