51224920 has 16 divisors (see below), whose sum is σ = 115256160. Its totient is φ = 20489952.

The previous prime is 51224881. The next prime is 51224923. The reversal of 51224920 is 2942215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51224923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640272 + ... + 640351.

It is an arithmetic number, because the mean of its divisors is an integer number (7203510).

Almost surely, 2^51224920 is an apocalyptic number.

It is an amenable number.

51224920 is an abundant number, since it is smaller than the sum of its proper divisors (64031240).

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

51224920 is a wasteful number, since it uses less digits than its factorization.

51224920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280634 (or 1280630 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 51224920 is about 7157.1586541029. The cubic root of 51224920 is about 371.3873408728.

The spelling of 51224920 in words is "fifty-one million, two hundred twenty-four thousand, nine hundred twenty".