16864909 has 2 divisors, whose sum is σ = 16864910. Its totient is φ = 16864908.

The previous prime is 16864907. The next prime is 16864927. The reversal of 16864909 is 90946861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9455625 + 7409284 = 3075^2 + 2722^2 .

It is a cyclic number.

It is not a de Polignac number, because 16864909 - 2¹ = 16864907 is a prime.

Together with 16864907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16864907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8432454 + 8432455.

It is an arithmetic number, because the mean of its divisors is an integer number (8432455).

Almost surely, 2^16864909 is an apocalyptic number.

It is an amenable number.

16864909 is a deficient number, since it is larger than the sum of its proper divisors (1).

16864909 is an equidigital number, since it uses as much as digits as its factorization.

16864909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 16864909 is about 4106.6907602107. The cubic root of 16864909 is about 256.4452547929.

The spelling of 16864909 in words is "sixteen million, eight hundred sixty-four thousand, nine hundred nine".