51049866 has 48 divisors (see below), whose sum is σ = 120165120. Its totient is φ = 14414400.

The previous prime is 51049841. The next prime is 51049877. The reversal of 51049866 is 66894015.

51049866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 25191 + ... + 27141.

It is an arithmetic number, because the mean of its divisors is an integer number (2503440).

Almost surely, 2^51049866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51049866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60082560).

51049866 is an abundant number, since it is smaller than the sum of its proper divisors (69115254).

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

51049866 is a wasteful number, since it uses less digits than its factorization.

51049866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059 (or 2052 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 51049866 is about 7144.9188938714. The cubic root of 51049866 is about 370.9638032800.

It can be divided in two parts, 51049 and 866, that added together give a palindrome (51915).

The spelling of 51049866 in words is "fifty-one million, forty-nine thousand, eight hundred sixty-six".