1218424631 has 2 divisors, whose sum is σ = 1218424632. Its totient is φ = 1218424630.

The previous prime is 1218424621. The next prime is 1218424639. The reversal of 1218424631 is 1364248121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1218424631 - 2⁶ = 1218424567 is a prime.

It is a super-2 number, since 2×1218424631² = 2969117162854972322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218424639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609212315 + 609212316.

It is an arithmetic number, because the mean of its divisors is an integer number (609212316).

Almost surely, 2^1218424631 is an apocalyptic number.

1218424631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218424631 is an equidigital number, since it uses as much as digits as its factorization.

1218424631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 32.

The square root of 1218424631 is about 34905.9397667503. The cubic root of 1218424631 is about 1068.0696061911.

The spelling of 1218424631 in words is "one billion, two hundred eighteen million, four hundred twenty-four thousand, six hundred thirty-one".