1218402919 has 2 divisors, whose sum is σ = 1218402920. Its totient is φ = 1218402918.

The previous prime is 1218402907. The next prime is 1218402929. The reversal of 1218402919 is 9192048121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1218402919 - 2⁹ = 1218402407 is a prime.

It is a super-2 number, since 2×1218402919² = 2969011346055441122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218402929) 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, 609201459 + 609201460.

It is an arithmetic number, because the mean of its divisors is an integer number (609201460).

Almost surely, 2^1218402919 is an apocalyptic number.

1218402919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218402919 is an equidigital number, since it uses as much as digits as its factorization.

1218402919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1218402919 is about 34905.6287581244. The cubic root of 1218402919 is about 1068.0632619154.

The spelling of 1218402919 in words is "one billion, two hundred eighteen million, four hundred two thousand, nine hundred nineteen".