1218244801 has 2 divisors, whose sum is σ = 1218244802. Its totient is φ = 1218244800.

The previous prime is 1218244787. The next prime is 1218244829. The reversal of 1218244801 is 1084428121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664866225 + 553378576 = 25785^2 + 23524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218244801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218244891) 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, 609122400 + 609122401.

It is an arithmetic number, because the mean of its divisors is an integer number (609122401).

Almost surely, 2^1218244801 is an apocalyptic number.

It is an amenable number.

1218244801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218244801 is an equidigital number, since it uses as much as digits as its factorization.

1218244801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 1218244801 is about 34903.3637490715. The cubic root of 1218244801 is about 1068.0170573498.

The spelling of 1218244801 in words is "one billion, two hundred eighteen million, two hundred forty-four thousand, eight hundred one".