51105930 has 64 divisors (see below), whose sum is σ = 126783360. Its totient is φ = 13176576.

The previous prime is 51105911. The next prime is 51105941. The reversal of 51105930 is 3950115.

It is a super-2 number, since 2×51105930² = 5223632162329800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51105930.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 223056 + ... + 223284.

It is an arithmetic number, because the mean of its divisors is an integer number (1980990).

Almost surely, 2^51105930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51105930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63391680).

51105930 is an abundant number, since it is smaller than the sum of its proper divisors (75677430).

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

51105930 is a wasteful number, since it uses less digits than its factorization.

51105930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455.

The product of its (nonzero) digits is 675, while the sum is 24.

The square root of 51105930 is about 7148.8411648322. The cubic root of 51105930 is about 371.0995535927.

The spelling of 51105930 in words is "fifty-one million, one hundred five thousand, nine hundred thirty".