51311844 has 36 divisors (see below), whose sum is σ = 132157116. Its totient is φ = 16780608.

The previous prime is 51311809. The next prime is 51311863. The reversal of 51311844 is 44811315.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 43956900 + 7354944 = 6630^2 + 2712^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11539 + ... + 15354.

It is an arithmetic number, because the mean of its divisors is an integer number (3671031).

Almost surely, 2^51311844 is an apocalyptic number.

It is an amenable number.

51311844 is an abundant number, since it is smaller than the sum of its proper divisors (80845272).

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

51311844 is a wasteful number, since it uses less digits than its factorization.

51311844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26956 (or 26951 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 51311844 is about 7163.2286016851. The cubic root of 51311844 is about 371.5972922680.

The spelling of 51311844 in words is "fifty-one million, three hundred eleven thousand, eight hundred forty-four".