618909817 has 2 divisors, whose sum is σ = 618909818. Its totient is φ = 618909816.

The previous prime is 618909791. The next prime is 618909821. The reversal of 618909817 is 718909816.

618909817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393189241 + 225720576 = 19829^2 + 15024^2 .

It is a cyclic number.

It is not a de Polignac number, because 618909817 - 2⁷ = 618909689 is a prime.

It is not a weakly prime, because it can be changed into another prime (618909847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309454908 + 309454909.

It is an arithmetic number, because the mean of its divisors is an integer number (309454909).

Almost surely, 2^618909817 is an apocalyptic number.

It is an amenable number.

618909817 is a deficient number, since it is larger than the sum of its proper divisors (1).

618909817 is an equidigital number, since it uses as much as digits as its factorization.

618909817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 618909817 is about 24877.8981628272. The cubic root of 618909817 is about 852.2018195625.

Subtracting 618909817 from its reverse (718909816), we obtain a palindrome (99999999).

The spelling of 618909817 in words is "six hundred eighteen million, nine hundred nine thousand, eight hundred seventeen".