16864669 has 2 divisors, whose sum is σ = 16864670. Its totient is φ = 16864668.

The previous prime is 16864667. The next prime is 16864691. The reversal of 16864669 is 96646861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12517444 + 4347225 = 3538^2 + 2085^2 .

It is an emirp because it is prime and its reverse (96646861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16864669 - 2¹ = 16864667 is a prime.

It is a super-2 number, since 2×16864669² = 568834120959122, which contains 22 as substring.

Together with 16864667, 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 (16864667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8432334 + 8432335.

It is an arithmetic number, because the mean of its divisors is an integer number (8432335).

Almost surely, 2^16864669 is an apocalyptic number.

It is an amenable number.

16864669 is a deficient number, since it is larger than the sum of its proper divisors (1).

16864669 is an equidigital number, since it uses as much as digits as its factorization.

16864669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The square root of 16864669 is about 4106.6615394990. The cubic root of 16864669 is about 256.4440383192. Note that the first 3 decimals are identical.

The spelling of 16864669 in words is "sixteen million, eight hundred sixty-four thousand, six hundred sixty-nine".