1284873221 has 2 divisors, whose sum is σ = 1284873222. Its totient is φ = 1284873220.

The previous prime is 1284873179. The next prime is 1284873229. The reversal of 1284873221 is 1223784821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1167930625 + 116942596 = 34175^2 + 10814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1284873221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1284873229) 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, 642436610 + 642436611.

It is an arithmetic number, because the mean of its divisors is an integer number (642436611).

Almost surely, 2^1284873221 is an apocalyptic number.

It is an amenable number.

1284873221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284873221 is an equidigital number, since it uses as much as digits as its factorization.

1284873221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 38.

The square root of 1284873221 is about 35845.1282742858. The cubic root of 1284873221 is about 1087.1432138434.

The spelling of 1284873221 in words is "one billion, two hundred eighty-four million, eight hundred seventy-three thousand, two hundred twenty-one".