10664209 has 2 divisors, whose sum is σ = 10664210. Its totient is φ = 10664208.

The previous prime is 10664179. The next prime is 10664221. The reversal of 10664209 is 90246601.

10664209 is digitally balanced in base 3, 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., 9859600 + 804609 = 3140^2 + 897^2 .

It is an emirp because it is prime and its reverse (90246601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10664209 - 2²¹ = 8567057 is a prime.

It is a super-2 number, since 2×10664209² = 227450707191362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10664299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5332104 + 5332105.

It is an arithmetic number, because the mean of its divisors is an integer number (5332105).

Almost surely, 2^10664209 is an apocalyptic number.

It is an amenable number.

10664209 is a deficient number, since it is larger than the sum of its proper divisors (1).

10664209 is an equidigital number, since it uses as much as digits as its factorization.

10664209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 10664209 is about 3265.6100502050. The cubic root of 10664209 is about 220.1115756349. Note that the first 3 decimals are identical.

The spelling of 10664209 in words is "ten million, six hundred sixty-four thousand, two hundred nine".