618544889 has 2 divisors, whose sum is σ = 618544890. Its totient is φ = 618544888.

The previous prime is 618544859. The next prime is 618544903. The reversal of 618544889 is 988445816.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604914025 + 13630864 = 24595^2 + 3692^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618544889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 618544889.

It is not a weakly prime, because it can be changed into another prime (618544859) 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, 309272444 + 309272445.

It is an arithmetic number, because the mean of its divisors is an integer number (309272445).

Almost surely, 2^618544889 is an apocalyptic number.

It is an amenable number.

618544889 is a deficient number, since it is larger than the sum of its proper divisors (1).

618544889 is an equidigital number, since it uses as much as digits as its factorization.

618544889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2211840, while the sum is 53.

The square root of 618544889 is about 24870.5626997059. The cubic root of 618544889 is about 852.0342919515.

The spelling of 618544889 in words is "six hundred eighteen million, five hundred forty-four thousand, eight hundred eighty-nine".