51144613 has 4 divisors (see below), whose sum is σ = 55078828. Its totient is φ = 47210400.

The previous prime is 51144607. The next prime is 51144623. The reversal of 51144613 is 31644115.

51144613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3161284 + 47983329 = 1778^2 + 6927^2 .

It is a cyclic number.

It is not a de Polignac number, because 51144613 - 2⁵ = 51144581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51144623) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1967088 + ... + 1967113.

It is an arithmetic number, because the mean of its divisors is an integer number (13769707).

Almost surely, 2^51144613 is an apocalyptic number.

It is an amenable number.

51144613 is a deficient number, since it is larger than the sum of its proper divisors (3934215).

51144613 is a wasteful number, since it uses less digits than its factorization.

51144613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934214.

The product of its digits is 1440, while the sum is 25.

The square root of 51144613 is about 7151.5461964529. The cubic root of 51144613 is about 371.1931606271.

Adding to 51144613 its reverse (31644115), we get a palindrome (82788728).

The spelling of 51144613 in words is "fifty-one million, one hundred forty-four thousand, six hundred thirteen".