51535220 has 48 divisors (see below), whose sum is σ = 124286400. Its totient is φ = 17752320.

The previous prime is 51535219. The next prime is 51535307. The reversal of 51535220 is 2253515.

51535220 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 an unprimeable number.

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, 1985 + ... + 10344.

It is an arithmetic number, because the mean of its divisors is an integer number (2589300).

Almost surely, 2^51535220 is an apocalyptic number.

It is an amenable number.

51535220 is an abundant number, since it is smaller than the sum of its proper divisors (72751180).

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

51535220 is a wasteful number, since it uses less digits than its factorization.

51535220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12368 (or 12366 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51535220 is about 7178.8035214790. The cubic root of 51535220 is about 372.1357368765.

Adding to 51535220 its reverse (2253515), we get a palindrome (53788735).

The spelling of 51535220 in words is "fifty-one million, five hundred thirty-five thousand, two hundred twenty".