51555424 has 24 divisors (see below), whose sum is σ = 107471448. Its totient is φ = 24261120.

The previous prime is 51555421. The next prime is 51555437. The reversal of 51555424 is 42455515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555421) 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, 46842 + ... + 47929.

It is an arithmetic number, because the mean of its divisors is an integer number (4477977).

Almost surely, 2^51555424 is an apocalyptic number.

It is an amenable number.

51555424 is an abundant number, since it is smaller than the sum of its proper divisors (55916024).

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

51555424 is a wasteful number, since it uses less digits than its factorization.

51555424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94798 (or 94790 counting only the distinct ones).

The product of its digits is 20000, while the sum is 31.

The square root of 51555424 is about 7180.2105818701. The cubic root of 51555424 is about 372.1843615394.

Subtracting from 51555424 its reverse (42455515), we obtain a palindrome (9099909).

The spelling of 51555424 in words is "fifty-one million, five hundred fifty-five thousand, four hundred twenty-four".