4218990989 has 2 divisors, whose sum is σ = 4218990990. Its totient is φ = 4218990988.

The previous prime is 4218990953. The next prime is 4218990991. The reversal of 4218990989 is 9890998124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2133516100 + 2085474889 = 46190^2 + 45667^2 .

It is a cyclic number.

It is not a de Polignac number, because 4218990989 - 2¹⁶ = 4218925453 is a prime.

Together with 4218990991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4218990949) 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, 2109495494 + 2109495495.

It is an arithmetic number, because the mean of its divisors is an integer number (2109495495).

Almost surely, 2^4218990989 is an apocalyptic number.

It is an amenable number.

4218990989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4218990989 is an equidigital number, since it uses as much as digits as its factorization.

4218990989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 59.

The square root of 4218990989 is about 64953.7603915278. The cubic root of 4218990989 is about 1615.8567840528.

The spelling of 4218990989 in words is "four billion, two hundred eighteen million, nine hundred ninety thousand, nine hundred eighty-nine".