1218246779 has 2 divisors, whose sum is σ = 1218246780. Its totient is φ = 1218246778.

The previous prime is 1218246763. The next prime is 1218246847. The reversal of 1218246779 is 9776428121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1218246779 - 2⁴ = 1218246763 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218246739) 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, 609123389 + 609123390.

It is an arithmetic number, because the mean of its divisors is an integer number (609123390).

Almost surely, 2^1218246779 is an apocalyptic number.

1218246779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218246779 is an equidigital number, since it uses as much as digits as its factorization.

1218246779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 1218246779 is about 34903.3920844379. The cubic root of 1218246779 is about 1068.0176353772.

The spelling of 1218246779 in words is "one billion, two hundred eighteen million, two hundred forty-six thousand, seven hundred seventy-nine".