1218424643 has 2 divisors, whose sum is σ = 1218424644. Its totient is φ = 1218424642.

The previous prime is 1218424639. The next prime is 1218424661. The reversal of 1218424643 is 3464248121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3464248121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1218424643 - 2² = 1218424639 is a prime.

It is a super-3 number, since 3×1218424643³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1218424693) 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, 609212321 + 609212322.

It is an arithmetic number, because the mean of its divisors is an integer number (609212322).

Almost surely, 2^1218424643 is an apocalyptic number.

1218424643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218424643 is an equidigital number, since it uses as much as digits as its factorization.

1218424643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 35.

The square root of 1218424643 is about 34905.9399386408. The cubic root of 1218424643 is about 1068.0696096975.

The spelling of 1218424643 in words is "one billion, two hundred eighteen million, four hundred twenty-four thousand, six hundred forty-three".