51144421 has 4 divisors (see below), whose sum is σ = 51409612. Its totient is φ = 50879232.

The previous prime is 51144419. The next prime is 51144427. The reversal of 51144421 is 12444115.

51144421 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 9541921 + 41602500 = 3089^2 + 6450^2 .

It is a cyclic number.

It is not a de Polignac number, because 51144421 - 2¹ = 51144419 is a prime.

It is a super-3 number, since 3×51144421³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51144392 and 51144401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51144427) 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, 132306 + ... + 132691.

It is an arithmetic number, because the mean of its divisors is an integer number (12852403).

Almost surely, 2^51144421 is an apocalyptic number.

It is an amenable number.

51144421 is a deficient number, since it is larger than the sum of its proper divisors (265191).

51144421 is a wasteful number, since it uses less digits than its factorization.

51144421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265190.

The product of its digits is 640, while the sum is 22.

The square root of 51144421 is about 7151.5327727698. The cubic root of 51144421 is about 371.1926961326.

Adding to 51144421 its reverse (12444115), we get a palindrome (63588536).

The spelling of 51144421 in words is "fifty-one million, one hundred forty-four thousand, four hundred twenty-one".