51005844 has 18 divisors (see below), whose sum is σ = 128931530. Its totient is φ = 17001936.

The previous prime is 51005813. The next prime is 51005849. The reversal of 51005844 is 44850015.

It can be written as a sum of positive squares in only one way, i.e., 50979600 + 26244 = 7140^2 + 162^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×51005844² = 5203192244304672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 708379 + ... + 708450.

Almost surely, 2^51005844 is an apocalyptic number.

It is an amenable number.

51005844 is an abundant number, since it is smaller than the sum of its proper divisors (77925686).

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

51005844 is a wasteful number, since it uses less digits than its factorization.

51005844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416839 (or 1416834 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 51005844 is about 7141.8375786628. The cubic root of 51005844 is about 370.8571411330.

Adding to 51005844 its reverse (44850015), we get a palindrome (95855859).

The spelling of 51005844 in words is "fifty-one million, five thousand, eight hundred forty-four".