51223120 has 40 divisors (see below), whose sum is σ = 128257416. Its totient is φ = 18912768.

The previous prime is 51223111. The next prime is 51223121. The reversal of 51223120 is 2132215.

It can be written as a sum of positive squares in 4 ways, for example, as 414736 + 50808384 = 644^2 + 7128^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 51223094 and 51223103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51223121) 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 7 ways as a sum of consecutive naturals, for example, 23587 + ... + 25666.

Almost surely, 2^51223120 is an apocalyptic number.

It is an amenable number.

51223120 is an abundant number, since it is smaller than the sum of its proper divisors (77034296).

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

51223120 is a wasteful number, since it uses less digits than its factorization.

51223120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49279 (or 49273 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51223120 is about 7157.0329047728. The cubic root of 51223120 is about 371.3829907437.

Adding to 51223120 its reverse (2132215), we get a palindrome (53355335).

It can be divided in two parts, 512 and 23120, that added together give a palindrome (23632).

The spelling of 51223120 in words is "fifty-one million, two hundred twenty-three thousand, one hundred twenty".