918989 has 2 divisors, whose sum is σ = 918990. Its totient is φ = 918988.

The previous prime is 918971. The next prime is 919013. The reversal of 918989 is 989819.

918989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 917764 + 1225 = 958^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 918989 - 2⁸ = 918733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459494 + 459495.

It is an arithmetic number, because the mean of its divisors is an integer number (459495).

2⁹¹⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

918989 is a deficient number, since it is larger than the sum of its proper divisors (1).

918989 is an equidigital number, since it uses as much as digits as its factorization.

918989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 44.

The square root of 918989 is about 958.6391396141. The cubic root of 918989 is about 97.2232432123.

The spelling of 918989 in words is "nine hundred eighteen thousand, nine hundred eighty-nine".