16564901 has 2 divisors, whose sum is σ = 16564902. Its totient is φ = 16564900.

The previous prime is 16564883. The next prime is 16564907. The reversal of 16564901 is 10946561.

It is a Cunningham number, because it is equal to 4070²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 1 = 4070^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 16564901 - 2⁶ = 16564837 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 (16564907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282450 + 8282451.

It is an arithmetic number, because the mean of its divisors is an integer number (8282451).

Almost surely, 2^16564901 is an apocalyptic number.

It is an amenable number.

16564901 is a deficient number, since it is larger than the sum of its proper divisors (1).

16564901 is an equidigital number, since it uses as much as digits as its factorization.

16564901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 16564901 is about 4070.0001228501. Note that the first 3 decimals coincide. The cubic root of 16564901 is about 254.9155224463.

The spelling of 16564901 in words is "sixteen million, five hundred sixty-four thousand, nine hundred one".