618685189 has 2 divisors, whose sum is σ = 618685190. Its totient is φ = 618685188.

The previous prime is 618685129. The next prime is 618685253. The reversal of 618685189 is 981586816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362140900 + 256544289 = 19030^2 + 16017^2 .

It is a cyclic number.

It is not a de Polignac number, because 618685189 - 2⁷ = 618685061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618685129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309342594 + 309342595.

It is an arithmetic number, because the mean of its divisors is an integer number (309342595).

Almost surely, 2^618685189 is an apocalyptic number.

It is an amenable number.

618685189 is a deficient number, since it is larger than the sum of its proper divisors (1).

618685189 is an equidigital number, since it uses as much as digits as its factorization.

618685189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 52.

The square root of 618685189 is about 24873.3831434327. The cubic root of 618685189 is about 852.0987073110.

The spelling of 618685189 in words is "six hundred eighteen million, six hundred eighty-five thousand, one hundred eighty-nine".