918899909 has 2 divisors, whose sum is σ = 918899910. Its totient is φ = 918899908.

The previous prime is 918899903. The next prime is 918899911. The reversal of 918899909 is 909998819.

918899909 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., 517699009 + 401200900 = 22753^2 + 20030^2 .

It is a cyclic number.

It is not a de Polignac number, because 918899909 - 2²⁸ = 650464453 is a prime.

It is a Sophie Germain prime.

Together with 918899911, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918899903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459449954 + 459449955.

It is an arithmetic number, because the mean of its divisors is an integer number (459449955).

Almost surely, 2^918899909 is an apocalyptic number.

It is an amenable number.

918899909 is a deficient number, since it is larger than the sum of its proper divisors (1).

918899909 is an equidigital number, since it uses as much as digits as its factorization.

918899909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 62.

The square root of 918899909 is about 30313.3618887777. The cubic root of 918899909 is about 972.2010135532.

The spelling of 918899909 in words is "nine hundred eighteen million, eight hundred ninety-nine thousand, nine hundred nine".