51129912 has 64 divisors (see below), whose sum is σ = 138931200. Its totient is φ = 15621120.

The previous prime is 51129853. The next prime is 51129913. The reversal of 51129912 is 21992115.

It is a super-2 number, since 2×51129912² = 5228535802255488, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51129912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51129913) 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 15 ways as a sum of consecutive naturals, for example, 12328 + ... + 15944.

It is an arithmetic number, because the mean of its divisors is an integer number (2170800).

Almost surely, 2^51129912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51129912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69465600).

51129912 is an abundant number, since it is smaller than the sum of its proper divisors (87801288).

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

51129912 is a wasteful number, since it uses less digits than its factorization.

51129912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676 (or 3672 counting only the distinct ones).

The product of its digits is 1620, while the sum is 30.

The square root of 51129912 is about 7150.5183028925. The cubic root of 51129912 is about 371.1575919832.

The spelling of 51129912 in words is "fifty-one million, one hundred twenty-nine thousand, nine hundred twelve".