51331120 has 20 divisors (see below), whose sum is σ = 119345040. Its totient is φ = 20532416.

The previous prime is 51331117. The next prime is 51331151. The reversal of 51331120 is 2113315.

It is a tau number, because it is divible by the number of its divisors (20).

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 = 51331094 and 51331103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320740 + ... + 320899.

It is an arithmetic number, because the mean of its divisors is an integer number (5967252).

Almost surely, 2^51331120 is an apocalyptic number.

It is an amenable number.

51331120 is an abundant number, since it is smaller than the sum of its proper divisors (68013920).

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

51331120 is a wasteful number, since it uses less digits than its factorization.

51331120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641652 (or 641646 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 51331120 is about 7164.5739580243. The cubic root of 51331120 is about 371.6438183206.

Adding to 51331120 its reverse (2113315), we get a palindrome (53444435).

The spelling of 51331120 in words is "fifty-one million, three hundred thirty-one thousand, one hundred twenty".