51282821 has 2 divisors, whose sum is σ = 51282822. Its totient is φ = 51282820.

The previous prime is 51282811. The next prime is 51282827. The reversal of 51282821 is 12828215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42432196 + 8850625 = 6514^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 51282821 - 2¹⁴ = 51266437 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51282827) 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 as a sum of consecutive naturals, namely, 25641410 + 25641411.

It is an arithmetic number, because the mean of its divisors is an integer number (25641411).

Almost surely, 2^51282821 is an apocalyptic number.

It is an amenable number.

51282821 is a deficient number, since it is larger than the sum of its proper divisors (1).

51282821 is an equidigital number, since it uses as much as digits as its factorization.

51282821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 29.

The square root of 51282821 is about 7161.2024828237. The cubic root of 51282821 is about 371.5272181137.

The spelling of 51282821 in words is "fifty-one million, two hundred eighty-two thousand, eight hundred twenty-one".