51813224 has 16 divisors (see below), whose sum is σ = 98983620. Its totient is φ = 25417600.

The previous prime is 51813221. The next prime is 51813233. The reversal of 51813224 is 42231815.

51813224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 42016324 + 9796900 = 6482^2 + 3130^2 .

It is a super-2 number, since 2×51813224² = 5369220362548352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51813193 and 51813202.

It is not an unprimeable number, because it can be changed into a prime (51813221) 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 3 ways as a sum of consecutive naturals, for example, 60677 + ... + 61524.

Almost surely, 2^51813224 is an apocalyptic number.

It is an amenable number.

51813224 is a deficient number, since it is larger than the sum of its proper divisors (47170396).

51813224 is a wasteful number, since it uses less digits than its factorization.

51813224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122260 (or 122256 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 51813224 is about 7198.1403153870. The cubic root of 51813224 is about 372.8036927004.

The spelling of 51813224 in words is "fifty-one million, eight hundred thirteen thousand, two hundred twenty-four".