1284278867 has 2 divisors, whose sum is σ = 1284278868. Its totient is φ = 1284278866.

The previous prime is 1284278861. The next prime is 1284278869. The reversal of 1284278867 is 7688724821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1284278867 - 2⁴ = 1284278851 is a prime.

Together with 1284278869, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1284278861) 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, 642139433 + 642139434.

It is an arithmetic number, because the mean of its divisors is an integer number (642139434).

Almost surely, 2^1284278867 is an apocalyptic number.

1284278867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284278867 is an equidigital number, since it uses as much as digits as its factorization.

1284278867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2408448, while the sum is 53.

The square root of 1284278867 is about 35836.8367326136. The cubic root of 1284278867 is about 1086.9755585023.

The spelling of 1284278867 in words is "one billion, two hundred eighty-four million, two hundred seventy-eight thousand, eight hundred sixty-seven".