1284548821 has 2 divisors, whose sum is σ = 1284548822. Its totient is φ = 1284548820.

The previous prime is 1284548813. The next prime is 1284548843. The reversal of 1284548821 is 1288454821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 949256100 + 335292721 = 30810^2 + 18311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1284548821 - 2³ = 1284548813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1284548801) 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 as a sum of consecutive naturals, namely, 642274410 + 642274411.

It is an arithmetic number, because the mean of its divisors is an integer number (642274411).

Almost surely, 2^1284548821 is an apocalyptic number.

It is an amenable number.

1284548821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284548821 is an equidigital number, since it uses as much as digits as its factorization.

1284548821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163840, while the sum is 43.

The square root of 1284548821 is about 35840.6029664681. The cubic root of 1284548821 is about 1087.0517135208.

The spelling of 1284548821 in words is "one billion, two hundred eighty-four million, five hundred forty-eight thousand, eight hundred twenty-one".