618628289 has 2 divisors, whose sum is σ = 618628290. Its totient is φ = 618628288.

The previous prime is 618628279. The next prime is 618628313. The reversal of 618628289 is 982826816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 533841025 + 84787264 = 23105^2 + 9208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618628289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (618628279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309314144 + 309314145.

It is an arithmetic number, because the mean of its divisors is an integer number (309314145).

Almost surely, 2^618628289 is an apocalyptic number.

It is an amenable number.

618628289 is a deficient number, since it is larger than the sum of its proper divisors (1).

618628289 is an equidigital number, since it uses as much as digits as its factorization.

618628289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 50.

The square root of 618628289 is about 24872.2393241944. The cubic root of 618628289 is about 852.0725842230.

The spelling of 618628289 in words is "six hundred eighteen million, six hundred twenty-eight thousand, two hundred eighty-nine".