10985209 has 2 divisors, whose sum is σ = 10985210. Its totient is φ = 10985208.

The previous prime is 10985207. The next prime is 10985243. The reversal of 10985209 is 90258901.

It is an a-pointer prime, because the next prime (10985243) can be obtained adding 10985209 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9903609 + 1081600 = 3147^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 10985209 - 2¹ = 10985207 is a prime.

Together with 10985207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (10985201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5492604 + 5492605.

It is an arithmetic number, because the mean of its divisors is an integer number (5492605).

Almost surely, 2^10985209 is an apocalyptic number.

It is an amenable number.

10985209 is a deficient number, since it is larger than the sum of its proper divisors (1).

10985209 is an equidigital number, since it uses as much as digits as its factorization.

10985209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 10985209 is about 3314.3942131255. The cubic root of 10985209 is about 222.2982828617.

The spelling of 10985209 in words is "ten million, nine hundred eighty-five thousand, two hundred nine".