51044409 has 24 divisors (see below), whose sum is σ = 79726920. Its totient is φ = 31283712.

The previous prime is 51044377. The next prime is 51044417. The reversal of 51044409 is 90444015.

It can be written as a sum of positive squares in 4 ways, for example, as 5076009 + 45968400 = 2253^2 + 6780^2 .

It is not a de Polignac number, because 51044409 - 2⁵ = 51044377 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51044449) 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 23 ways as a sum of consecutive naturals, for example, 33537 + ... + 35025.

It is an arithmetic number, because the mean of its divisors is an integer number (3321955).

Almost surely, 2^51044409 is an apocalyptic number.

It is an amenable number.

51044409 is a deficient number, since it is larger than the sum of its proper divisors (28682511).

51044409 is a wasteful number, since it uses less digits than its factorization.

51044409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51044409 is about 7144.5370038933. The cubic root of 51044409 is about 370.9505846909.

The spelling of 51044409 in words is "fifty-one million, forty-four thousand, four hundred nine".