51921924 has 12 divisors (see below), whose sum is σ = 121151184. Its totient is φ = 17307304.

The previous prime is 51921923. The next prime is 51921929. The reversal of 51921924 is 42912915.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (51921923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2163402 + ... + 2163425.

It is an arithmetic number, because the mean of its divisors is an integer number (10095932).

Almost surely, 2^51921924 is an apocalyptic number.

It is an amenable number.

51921924 is an abundant number, since it is smaller than the sum of its proper divisors (69229260).

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

51921924 is a wasteful number, since it uses less digits than its factorization.

51921924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4326834 (or 4326832 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 51921924 is about 7205.6869207592. The cubic root of 51921924 is about 373.0642147108.

Subtracting from 51921924 its reverse (42912915), we obtain a palindrome (9009009).

The spelling of 51921924 in words is "fifty-one million, nine hundred twenty-one thousand, nine hundred twenty-four".