1284078779 has 2 divisors, whose sum is σ = 1284078780. Its totient is φ = 1284078778.

The previous prime is 1284078703. The next prime is 1284078787. The reversal of 1284078779 is 9778704821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1284078779 - 2¹² = 1284074683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1284078779.

It is not a weakly prime, because it can be changed into another prime (1284078079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642039389 + 642039390.

It is an arithmetic number, because the mean of its divisors is an integer number (642039390).

Almost surely, 2^1284078779 is an apocalyptic number.

1284078779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284078779 is an equidigital number, since it uses as much as digits as its factorization.

1284078779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 53.

The square root of 1284078779 is about 35834.0449712281. The cubic root of 1284078779 is about 1086.9191060534.

It can be divided in two parts, 12840 and 78779, that added together give a palindrome (91619).

The spelling of 1284078779 in words is "one billion, two hundred eighty-four million, seventy-eight thousand, seven hundred seventy-nine".