1218246851 has 2 divisors, whose sum is σ = 1218246852. Its totient is φ = 1218246850.

The previous prime is 1218246847. The next prime is 1218246901. The reversal of 1218246851 is 1586428121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1218246851 - 2² = 1218246847 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218246751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609123425 + 609123426.

It is an arithmetic number, because the mean of its divisors is an integer number (609123426).

Almost surely, 2^1218246851 is an apocalyptic number.

1218246851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218246851 is an equidigital number, since it uses as much as digits as its factorization.

1218246851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 38.

The square root of 1218246851 is about 34903.3931158562. The cubic root of 1218246851 is about 1068.0176564176.

The spelling of 1218246851 in words is "one billion, two hundred eighteen million, two hundred forty-six thousand, eight hundred fifty-one".