618994489 has 2 divisors, whose sum is σ = 618994490. Its totient is φ = 618994488.

The previous prime is 618994487. The next prime is 618994513. The reversal of 618994489 is 984499816.

It is a happy number.

618994489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 414733225 + 204261264 = 20365^2 + 14292^2 .

It is a cyclic number.

It is not a de Polignac number, because 618994489 - 2¹ = 618994487 is a prime.

It is a super-2 number, since 2×618994489² = 766308354824742242, which contains 22 as substring.

Together with 618994487, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (618994487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309497244 + 309497245.

It is an arithmetic number, because the mean of its divisors is an integer number (309497245).

Almost surely, 2^618994489 is an apocalyptic number.

It is an amenable number.

618994489 is a deficient number, since it is larger than the sum of its proper divisors (1).

618994489 is an equidigital number, since it uses as much as digits as its factorization.

618994489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4478976, while the sum is 58.

The square root of 618994489 is about 24879.5998561070. The cubic root of 618994489 is about 852.2406805511.

The spelling of 618994489 in words is "six hundred eighteen million, nine hundred ninety-four thousand, four hundred eighty-nine".