51144821 has 16 divisors (see below), whose sum is σ = 63216384. Its totient is φ = 40293504.

The previous prime is 51144811. The next prime is 51144833. The reversal of 51144821 is 12844115.

It is a cyclic number.

It is not a de Polignac number, because 51144821 - 2¹⁰ = 51143797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51144811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22865 + ... + 25001.

It is an arithmetic number, because the mean of its divisors is an integer number (3951024).

Almost surely, 2^51144821 is an apocalyptic number.

It is an amenable number.

51144821 is a deficient number, since it is larger than the sum of its proper divisors (12071563).

51144821 is a wasteful number, since it uses less digits than its factorization.

51144821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420.

The product of its digits is 1280, while the sum is 26.

The square root of 51144821 is about 7151.5607387479. The cubic root of 51144821 is about 371.1936638282.

Adding to 51144821 its reverse (12844115), we get a palindrome (63988936).

The spelling of 51144821 in words is "fifty-one million, one hundred forty-four thousand, eight hundred twenty-one".